21041494945566 has 32 divisors (see below), whose sum is σ = 44558724879360. Its totient is φ = 6601214057856.

The previous prime is 21041494945531. The next prime is 21041494945577. The reversal of 21041494945566 is 66554949414012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20001285 + ... + 21026991.

It is an arithmetic number, because the mean of its divisors is an integer number (1392460152480).

Almost surely, 2^{21041494945566} is an apocalyptic number.

21041494945566 is an abundant number, since it is smaller than the sum of its proper divisors (23517229933794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21041494945566 is a wasteful number, since it uses less digits than its factorization.

21041494945566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226848.

The product of its (nonzero) digits is 37324800, while the sum is 60.

The spelling of 21041494945566 in words is "twenty-one trillion, forty-one billion, four hundred ninety-four million, nine hundred forty-five thousand, five hundred sixty-six".