21374455662766 has 16 divisors (see below), whose sum is σ = 32460117758208. Its totient is φ = 10554512830200.

The previous prime is 21374455662739. The next prime is 21374455662803. The reversal of 21374455662766 is 66726655447312.

It is a super-3 number, since 3×21374455662766³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21374455662698 and 21374455662707.

It is a congruent 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, 23660280 + ... + 24547051.

It is an arithmetic number, because the mean of its divisors is an integer number (2028757359888).

Almost surely, 2^{21374455662766} is an apocalyptic number.

21374455662766 is a deficient number, since it is larger than the sum of its proper divisors (11085662095442).

21374455662766 is a wasteful number, since it uses less digits than its factorization.

21374455662766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48210087.

The product of its digits is 304819200, while the sum is 64.

The spelling of 21374455662766 in words is "twenty-one trillion, three hundred seventy-four billion, four hundred fifty-five million, six hundred sixty-two thousand, seven hundred sixty-six".