21771650394252 has 36 divisors (see below), whose sum is σ = 60036975330696. Its totient is φ = 6597469816320.

The previous prime is 21771650394227. The next prime is 21771650394289. The reversal of 21771650394252 is 25249305617712.

21771650394252 is a `hidden beast` number, since 2 + 1 + 77 + 16 + 503 + 9 + 4 + 2 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27489457173 + ... + 27489457964.

It is an arithmetic number, because the mean of its divisors is an integer number (1667693759186).

Almost surely, 2^{21771650394252} is an apocalyptic number.

21771650394252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21771650394252 is an abundant number, since it is smaller than the sum of its proper divisors (38265324936444).

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

21771650394252 is a wasteful number, since it uses less digits than its factorization.

21771650394252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54978915158 (or 54978915153 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 21771650394252 in words is "twenty-one trillion, seven hundred seventy-one billion, six hundred fifty million, three hundred ninety-four thousand, two hundred fifty-two".