21232111000021 has 4 divisors (see below), whose sum is σ = 21242226348000. Its totient is φ = 21221995652044.

The previous prime is 21232111000007. The next prime is 21232111000027. The reversal of 21232111000021 is 12000011123212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21232111000021 - 2⁵ = 21232110999989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232110999959 and 21232111000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232111000027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5057670841 + ... + 5057675038.

It is an arithmetic number, because the mean of its divisors is an integer number (5310556587000).

Almost surely, 2^{21232111000021} is an apocalyptic number.

It is an amenable number.

21232111000021 is a deficient number, since it is larger than the sum of its proper divisors (10115347979).

21232111000021 is a wasteful number, since it uses less digits than its factorization.

21232111000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115347978.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21232111000021 its reverse (12000011123212), we get a palindrome (33232122123233).

The spelling of 21232111000021 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred eleven million, twenty-one", and thus it is an aban number.