21770706155 has 32 divisors (see below), whose sum is σ = 28678164480. Its totient is φ = 15734436480.

The previous prime is 21770706119. The next prime is 21770706187. The reversal of 21770706155 is 55160707712.

It is a happy number.

It is not a de Polignac number, because 21770706155 - 2⁶ = 21770706091 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9111701 + ... + 9114089.

It is an arithmetic number, because the mean of its divisors is an integer number (896192640).

Almost surely, 2^21770706155 is an apocalyptic number.

21770706155 is a deficient number, since it is larger than the sum of its proper divisors (6907458325).

21770706155 is a wasteful number, since it uses less digits than its factorization.

21770706155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371.

The product of its (nonzero) digits is 102900, while the sum is 41.

The spelling of 21770706155 in words is "twenty-one billion, seven hundred seventy million, seven hundred six thousand, one hundred fifty-five".