21677617240377 has 32 divisors (see below), whose sum is σ = 33060901724928. Its totient is φ = 12376585506816.

The previous prime is 21677617240327. The next prime is 21677617240381. The reversal of 21677617240377 is 77304271677612.

It is not a de Polignac number, because 21677617240377 - 2¹⁶ = 21677617174841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21677617240377.

It is not an unprimeable number, because it can be changed into a prime (21677617240327) 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, 136195113 + ... + 136354185.

It is an arithmetic number, because the mean of its divisors is an integer number (1033153178904).

Almost surely, 2^{21677617240377} is an apocalyptic number.

It is an amenable number.

21677617240377 is a deficient number, since it is larger than the sum of its proper divisors (11383284484551).

21677617240377 is a wasteful number, since it uses less digits than its factorization.

21677617240377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164609.

The product of its (nonzero) digits is 29042496, while the sum is 60.

The spelling of 21677617240377 in words is "twenty-one trillion, six hundred seventy-seven billion, six hundred seventeen million, two hundred forty thousand, three hundred seventy-seven".