21120011100021 has 8 divisors (see below), whose sum is σ = 28178504638560. Its totient is φ = 14070762480752.

The previous prime is 21120011099987. The next prime is 21120011100031. The reversal of 21120011100021 is 12000111002112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120011100021 - 2¹¹ = 21120011097973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120011100031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2311224486 + ... + 2311233623.

It is an arithmetic number, because the mean of its divisors is an integer number (3522313079820).

Almost surely, 2^{21120011100021} is an apocalyptic number.

It is an amenable number.

21120011100021 is a deficient number, since it is larger than the sum of its proper divisors (7058493538539).

21120011100021 is a wasteful number, since it uses less digits than its factorization.

21120011100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4622459635.

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

Adding to 21120011100021 its reverse (12000111002112), we get a palindrome (33120122102133).

The spelling of 21120011100021 in words is "twenty-one trillion, one hundred twenty billion, eleven million, one hundred thousand, twenty-one".