21577751036 has 12 divisors (see below), whose sum is σ = 37762109112. Its totient is φ = 10788577008.

The previous prime is 21577751021. The next prime is 21577751081. The reversal of 21577751036 is 63015777512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201686 + ... + 289538.

It is an arithmetic number, because the mean of its divisors is an integer number (3146842426).

Almost surely, 2^21577751036 is an apocalyptic number.

It is an amenable number.

21577751036 is a deficient number, since it is larger than the sum of its proper divisors (16184358076).

21577751036 is a wasteful number, since it uses less digits than its factorization.

21577751036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149260 (or 149258 counting only the distinct ones).

The product of its (nonzero) digits is 308700, while the sum is 44.

The spelling of 21577751036 in words is "twenty-one billion, five hundred seventy-seven million, seven hundred fifty-one thousand, thirty-six".