21777665710137 has 16 divisors (see below), whose sum is σ = 29072059632000. Its totient is φ = 14500866167424.

The previous prime is 21777665710127. The next prime is 21777665710181. The reversal of 21777665710137 is 73101756677712.

It is not a de Polignac number, because 21777665710137 - 2²² = 21777661515833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21777665710127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9384439 + ... + 11472707.

It is an arithmetic number, because the mean of its divisors is an integer number (1817003727000).

Almost surely, 2^{21777665710137} is an apocalyptic number.

It is an amenable number.

21777665710137 is a deficient number, since it is larger than the sum of its proper divisors (7294393921863).

21777665710137 is a wasteful number, since it uses less digits than its factorization.

21777665710137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092480.

The product of its (nonzero) digits is 18151560, while the sum is 60.

The spelling of 21777665710137 in words is "twenty-one trillion, seven hundred seventy-seven billion, six hundred sixty-five million, seven hundred ten thousand, one hundred thirty-seven".