21641313546 has 24 divisors (see below), whose sum is σ = 47042259264. Its totient is φ = 7190271720.

The previous prime is 21641313521. The next prime is 21641313583. The reversal of 21641313546 is 64531314612.

21641313546 is a `hidden beast` number, since 2 + 1 + 641 + 3 + 1 + 3 + 5 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21641313546.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1952610 + ... + 1963661.

It is an arithmetic number, because the mean of its divisors is an integer number (1960094136).

Almost surely, 2^21641313546 is an apocalyptic number.

21641313546 is an abundant number, since it is smaller than the sum of its proper divisors (25400945718).

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

21641313546 is a wasteful number, since it uses less digits than its factorization.

21641313546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916586 (or 3916583 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The spelling of 21641313546 in words is "twenty-one billion, six hundred forty-one million, three hundred thirteen thousand, five hundred forty-six".