21232068655 has 32 divisors (see below), whose sum is σ = 30848256000. Its totient is φ = 13695091200.

The previous prime is 21232068631. The next prime is 21232068659. The reversal of 21232068655 is 55686023212.

It is a happy number.

It is not a de Polignac number, because 21232068655 - 2²³ = 21223680047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232068659) 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, 1180480 + ... + 1198330.

It is an arithmetic number, because the mean of its divisors is an integer number (964008000).

Almost surely, 2^21232068655 is an apocalyptic number.

21232068655 is a deficient number, since it is larger than the sum of its proper divisors (9616187345).

21232068655 is a wasteful number, since it uses less digits than its factorization.

21232068655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19879.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 21232068655 in words is "twenty-one billion, two hundred thirty-two million, sixty-eight thousand, six hundred fifty-five".