21027268089 has 32 divisors (see below), whose sum is σ = 31334244480. Its totient is φ = 13936104000.

The previous prime is 21027268069. The next prime is 21027268103. The reversal of 21027268089 is 98086272012.

It is not a de Polignac number, because 21027268089 - 2²³ = 21018879481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21027268049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7410379 + ... + 7413215.

It is an arithmetic number, because the mean of its divisors is an integer number (979195140).

Almost surely, 2^21027268089 is an apocalyptic number.

It is an amenable number.

21027268089 is a deficient number, since it is larger than the sum of its proper divisors (10306976391).

21027268089 is a wasteful number, since it uses less digits than its factorization.

21027268089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358 (or 4352 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 21027268089 in words is "twenty-one billion, twenty-seven million, two hundred sixty-eight thousand, eighty-nine".