21866855051670 has 32 divisors (see below), whose sum is σ = 52560088669440. Its totient is φ = 5822312842080.

The previous prime is 21866855051549. The next prime is 21866855051681. The reversal of 21866855051670 is 7615055866812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553011466 + ... + 553051005.

It is an arithmetic number, because the mean of its divisors is an integer number (1642502770920).

Almost surely, 2^{21866855051670} is an apocalyptic number.

21866855051670 is an abundant number, since it is smaller than the sum of its proper divisors (30693233617770).

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

21866855051670 is a wasteful number, since it uses less digits than its factorization.

21866855051670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106063140.

The product of its (nonzero) digits is 24192000, while the sum is 60.

The spelling of 21866855051670 in words is "twenty-one trillion, eight hundred sixty-six billion, eight hundred fifty-five million, fifty-one thousand, six hundred seventy".