21255670130942 has 64 divisors (see below), whose sum is σ = 34688437346304. Its totient is φ = 9710024688000.

The previous prime is 21255670130939. The next prime is 21255670130983. The reversal of 21255670130942 is 24903107655212.

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, 6043691768 + ... + 6043695284.

It is an arithmetic number, because the mean of its divisors is an integer number (542006833536).

Almost surely, 2^{21255670130942} is an apocalyptic number.

21255670130942 is a deficient number, since it is larger than the sum of its proper divisors (13432767215362).

21255670130942 is a wasteful number, since it uses less digits than its factorization.

21255670130942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7473.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 21255670130942 in words is "twenty-one trillion, two hundred fifty-five billion, six hundred seventy million, one hundred thirty thousand, nine hundred forty-two".