21214024352664 has 128 divisors (see below), whose sum is σ = 62797531668480. Its totient is φ = 5887268352000.

The previous prime is 21214024352657. The next prime is 21214024352707. The reversal of 21214024352664 is 46625342041212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23899737 + ... + 24771464.

It is an arithmetic number, because the mean of its divisors is an integer number (490605716160).

Almost surely, 2^{21214024352664} is an apocalyptic number.

21214024352664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21214024352664 is an abundant number, since it is smaller than the sum of its proper divisors (41583507315816).

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

21214024352664 is a wasteful number, since it uses less digits than its factorization.

21214024352664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48671361 (or 48671357 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 42.

Adding to 21214024352664 its reverse (46625342041212), we get a palindrome (67839366393876).

The spelling of 21214024352664 in words is "twenty-one trillion, two hundred fourteen billion, twenty-four million, three hundred fifty-two thousand, six hundred sixty-four".