21755065553170 has 32 divisors (see below), whose sum is σ = 39827183077440. Its totient is φ = 8553599545920.

The previous prime is 21755065553161. The next prime is 21755065553183. The reversal of 21755065553170 is 7135556055712.

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, 3402205 + ... + 7421935.

It is an arithmetic number, because the mean of its divisors is an integer number (1244599471170).

Almost surely, 2^{21755065553170} is an apocalyptic number.

21755065553170 is a deficient number, since it is larger than the sum of its proper divisors (18072117524270).

21755065553170 is a wasteful number, since it uses less digits than its factorization.

21755065553170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028970.

The product of its (nonzero) digits is 5512500, while the sum is 52.

The spelling of 21755065553170 in words is "twenty-one trillion, seven hundred fifty-five billion, sixty-five million, five hundred fifty-three thousand, one hundred seventy".