21213112132020 has 24 divisors (see below), whose sum is σ = 59396713969824. Its totient is φ = 5656829901856.

The previous prime is 21213112132007. The next prime is 21213112132027. The reversal of 21213112132020 is 2023121131212.

It is a super-2 number, since 2×21213112132020² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213112132027) 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 7 ways as a sum of consecutive naturals, for example, 176775934374 + ... + 176775934493.

It is an arithmetic number, because the mean of its divisors is an integer number (2474863082076).

Almost surely, 2^{21213112132020} is an apocalyptic number.

21213112132020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213112132020 is an abundant number, since it is smaller than the sum of its proper divisors (38183601837804).

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

21213112132020 is a wasteful number, since it uses less digits than its factorization.

21213112132020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353551868879 (or 353551868877 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21213112132020 its reverse (2023121131212), we get a palindrome (23236233263232).

The spelling of 21213112132020 in words is "twenty-one trillion, two hundred thirteen billion, one hundred twelve million, one hundred thirty-two thousand, twenty".