21011210112020 has 48 divisors (see below), whose sum is σ = 45113374994688. Its totient is φ = 8216349321600.

The previous prime is 21011210111999. The next prime is 21011210112121. The reversal of 21011210112020 is 2021101211012.

It is a junction number, because it is equal to n+sod(n) for n = 21011210111986 and 21011210112004.

It is a congruent number.

It is an unprimeable number.

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, 11827031 + ... + 13487070.

It is an arithmetic number, because the mean of its divisors is an integer number (939861979056).

Almost surely, 2^{21011210112020} is an apocalyptic number.

21011210112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011210112020 is an abundant number, since it is smaller than the sum of its proper divisors (24102164882668).

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

21011210112020 is a wasteful number, since it uses less digits than its factorization.

21011210112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25315040 (or 25315038 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011210112020 its reverse (2021101211012), we get a palindrome (23032311323032).

The spelling of 21011210112020 in words is "twenty-one trillion, eleven billion, two hundred ten million, one hundred twelve thousand, twenty".