21000100011020 has 48 divisors (see below), whose sum is σ = 47494383562080. Its totient is φ = 7753581090816.

The previous prime is 21000100011017. The next prime is 21000100011029. The reversal of 21000100011020 is 2011000100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000100010989 and 21000100011007.

It is not an unprimeable number, because it can be changed into a prime (21000100011029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5171219 + ... + 8291061.

It is an arithmetic number, because the mean of its divisors is an integer number (989466324210).

Almost surely, 2^{21000100011020} is an apocalyptic number.

21000100011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000100011020 is an abundant number, since it is smaller than the sum of its proper divisors (26494283551060).

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

21000100011020 is a wasteful number, since it uses less digits than its factorization.

21000100011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145754 (or 3145752 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21000100011020 its reverse (2011000100012), we get a palindrome (23011100111032).

The spelling of 21000100011020 in words is "twenty-one trillion, one hundred million, eleven thousand, twenty".