21660040602264 has 32 divisors (see below), whose sum is σ = 55037808091440. Its totient is φ = 7101652656000.

The previous prime is 21660040602241. The next prime is 21660040602269. The reversal of 21660040602264 is 46220604006612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660040602269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7397553387 + ... + 7397556314.

Almost surely, 2^{21660040602264} is an apocalyptic number.

21660040602264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21660040602264 is an abundant number, since it is smaller than the sum of its proper divisors (33377767489176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21660040602264 is a wasteful number, since it uses less digits than its factorization.

21660040602264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14795109771 (or 14795109767 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

Adding to 21660040602264 its reverse (46220604006612), we get a palindrome (67880644608876).

The spelling of 21660040602264 in words is "twenty-one trillion, six hundred sixty billion, forty million, six hundred two thousand, two hundred sixty-four".