21120010002021 has 32 divisors (see below), whose sum is σ = 32618849580288. Its totient is φ = 11905948454400.

The previous prime is 21120010002017. The next prime is 21120010002023. The reversal of 21120010002021 is 12020001002112.

It is not a de Polignac number, because 21120010002021 - 2² = 21120010002017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120010001988 and 21120010002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120010002023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17386440 + ... + 18561473.

It is an arithmetic number, because the mean of its divisors is an integer number (1019339049384).

Almost surely, 2^{21120010002021} is an apocalyptic number.

21120010002021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21120010002021 is a deficient number, since it is larger than the sum of its proper divisors (11498839578267).

21120010002021 is a wasteful number, since it uses less digits than its factorization.

21120010002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35948301.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120010002021 its reverse (12020001002112), we get a palindrome (33140011004133).

The spelling of 21120010002021 in words is "twenty-one trillion, one hundred twenty billion, ten million, two thousand, twenty-one".