21120011010021 has 32 divisors (see below), whose sum is σ = 35108836697088. Its totient is φ = 10971357114240.

The previous prime is 21120011009963. The next prime is 21120011010031. The reversal of 21120011010021 is 12001011002112.

It is not a de Polignac number, because 21120011010021 - 2⁷ = 21120011009893 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21120011009979 and 21120011010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120011010031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48784905 + ... + 49215921.

It is an arithmetic number, because the mean of its divisors is an integer number (1097151146784).

Almost surely, 2^{21120011010021} is an apocalyptic number.

21120011010021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21120011010021 is a deficient number, since it is larger than the sum of its proper divisors (13988825687067).

21120011010021 is a wasteful number, since it uses less digits than its factorization.

21120011010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643161.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21120011010021 its reverse (12001011002112), we get a palindrome (33121022012133).

The spelling of 21120011010021 in words is "twenty-one trillion, one hundred twenty billion, eleven million, ten thousand, twenty-one".