21771383136 has 48 divisors (see below), whose sum is σ = 57158244864. Its totient is φ = 7256065664.

The previous prime is 21771383119. The next prime is 21771383141. The reversal of 21771383136 is 63138317712.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912025 + ... + 935591.

It is an arithmetic number, because the mean of its divisors is an integer number (1190796768).

Almost surely, 2^21771383136 is an apocalyptic number.

It is an amenable number.

21771383136 is an abundant number, since it is smaller than the sum of its proper divisors (35386861728).

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

21771383136 is a wasteful number, since it uses less digits than its factorization.

21771383136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33203 (or 33195 counting only the distinct ones).

The product of its digits is 127008, while the sum is 42.

The spelling of 21771383136 in words is "twenty-one billion, seven hundred seventy-one million, three hundred eighty-three thousand, one hundred thirty-six".