21370439258640 has 120 divisors (see below), whose sum is σ = 74427171856128. Its totient is φ = 5698783797120.

The previous prime is 21370439258591. The next prime is 21370439258669. The reversal of 21370439258640 is 4685293407312.

21370439258640 is a `hidden beast` number, since 2 + 1 + 3 + 70 + 439 + 25 + 86 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 549631776 + ... + 549670655.

It is a 1-persistent number, because it is pandigital, but 2⋅21370439258640 = 42740878517280 is not.

Almost surely, 2^{21370439258640} is an apocalyptic number.

21370439258640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21370439258640 is an abundant number, since it is smaller than the sum of its proper divisors (53056732597488).

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

21370439258640 is a wasteful number, since it uses less digits than its factorization.

21370439258640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099302459 (or 1099302441 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 21370439258640 in words is "twenty-one trillion, three hundred seventy billion, four hundred thirty-nine million, two hundred fifty-eight thousand, six hundred forty".