21232677021 has 4 divisors (see below), whose sum is σ = 28310236032. Its totient is φ = 14155118012.

The previous prime is 21232677007. The next prime is 21232677031. The reversal of 21232677021 is 12077623212.

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 21232677021 - 2¹⁴ = 21232660637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232677031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3538779501 + ... + 3538779506.

It is an arithmetic number, because the mean of its divisors is an integer number (7077559008).

Almost surely, 2^21232677021 is an apocalyptic number.

It is an amenable number.

21232677021 is a deficient number, since it is larger than the sum of its proper divisors (7077559011).

21232677021 is an equidigital number, since it uses as much as digits as its factorization.

21232677021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077559010.

The product of its (nonzero) digits is 14112, while the sum is 33.

The spelling of 21232677021 in words is "twenty-one billion, two hundred thirty-two million, six hundred seventy-seven thousand, twenty-one".