21012368601 has 12 divisors (see below), whose sum is σ = 32590612752. Its totient is φ = 12007067688.

The previous prime is 21012368593. The next prime is 21012368623. The reversal of 21012368601 is 10686321012.

It is not a de Polignac number, because 21012368601 - 2³ = 21012368593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21012366601) 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 11 ways as a sum of consecutive naturals, for example, 71470495 + ... + 71470788.

It is an arithmetic number, because the mean of its divisors is an integer number (2715884396).

Almost surely, 2^21012368601 is an apocalyptic number.

21012368601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21012368601 is a deficient number, since it is larger than the sum of its proper divisors (11578244151).

21012368601 is a wasteful number, since it uses less digits than its factorization.

21012368601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142941300 (or 142941293 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 21012368601 its reverse (10686321012), we get a palindrome (31698689613).

The spelling of 21012368601 in words is "twenty-one billion, twelve million, three hundred sixty-eight thousand, six hundred one".