21211032130020 has 72 divisors (see below), whose sum is σ = 64340596265400. Its totient is φ = 5656234314240.

The previous prime is 21211032129977. The next prime is 21211032130021. The reversal of 21211032130020 is 2003123011212.

21211032130020 is a `hidden beast` number, since 2 + 1 + 21 + 1 + 0 + 321 + 300 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 964433987136 + 20246598142884 = 982056^2 + 4499622^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21211032129975 and 21211032130002.

It is not an unprimeable number, because it can be changed into a prime (21211032130021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30901506 + ... + 31580454.

It is an arithmetic number, because the mean of its divisors is an integer number (893619392575).

Almost surely, 2^{21211032130020} is an apocalyptic number.

21211032130020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211032130020 is an abundant number, since it is smaller than the sum of its proper divisors (43129564135380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211032130020 is a wasteful number, since it uses less digits than its factorization.

21211032130020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852525 (or 852520 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21211032130020 its reverse (2003123011212), we get a palindrome (23214155141232).

The spelling of 21211032130020 in words is "twenty-one trillion, two hundred eleven billion, thirty-two million, one hundred thirty thousand, twenty".