21677617240378 has 16 divisors (see below), whose sum is σ = 35512728471360. Its totient is φ = 9842277966400.

The previous prime is 21677617240327. The next prime is 21677617240381. The reversal of 21677617240378 is 87304271677612.

It is a happy 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, 559200958 + ... + 559239721.

It is an arithmetic number, because the mean of its divisors is an integer number (2219545529460).

Almost surely, 2^{21677617240378} is an apocalyptic number.

21677617240378 is a deficient number, since it is larger than the sum of its proper divisors (13835111230982).

21677617240378 is a wasteful number, since it uses less digits than its factorization.

21677617240378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118441573.

The product of its (nonzero) digits is 33191424, while the sum is 61.

The spelling of 21677617240378 in words is "twenty-one trillion, six hundred seventy-seven billion, six hundred seventeen million, two hundred forty thousand, three hundred seventy-eight".