21577650127 has 12 divisors (see below), whose sum is σ = 23888231080. Its totient is φ = 19474907760.

The previous prime is 21577650043. The next prime is 21577650151. The reversal of 21577650127 is 72105677512.

It is a de Polignac number, because none of the positive numbers 2^k-21577650127 is a prime.

It is a super-2 number, since 2×21577650127² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21577650167) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 624648 + ... + 658285.

Almost surely, 2^21577650127 is an apocalyptic number.

21577650127 is a deficient number, since it is larger than the sum of its proper divisors (2310580953).

21577650127 is a wasteful number, since it uses less digits than its factorization.

21577650127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283094 (or 1283083 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 43.

The spelling of 21577650127 in words is "twenty-one billion, five hundred seventy-seven million, six hundred fifty thousand, one hundred twenty-seven".