21164715166377 has 32 divisors (see below), whose sum is σ = 30692460432384. Its totient is φ = 12918673152000.

The previous prime is 21164715166373. The next prime is 21164715166381. The reversal of 21164715166377 is 77366151746112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21164715166373) and next prime (21164715166381).

It is not a de Polignac number, because 21164715166377 - 2² = 21164715166373 is a prime.

It is a super-2 number, since 2×21164715166377² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21164715166373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9979752 + ... + 11913222.

It is an arithmetic number, because the mean of its divisors is an integer number (959139388512).

Almost surely, 2^{21164715166377} is an apocalyptic number.

It is an amenable number.

21164715166377 is a deficient number, since it is larger than the sum of its proper divisors (9527745266007).

21164715166377 is a wasteful number, since it uses less digits than its factorization.

21164715166377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939329.

The product of its digits is 8890560, while the sum is 57.

The spelling of 21164715166377 in words is "twenty-one trillion, one hundred sixty-four billion, seven hundred fifteen million, one hundred sixty-six thousand, three hundred seventy-seven".