21457540611 has 72 divisors (see below), whose sum is σ = 34393872240. Its totient is φ = 12810932352.

The previous prime is 21457540603. The next prime is 21457540613. The reversal of 21457540611 is 11604575412.

21457540611 is a `hidden beast` number, since 2 + 1 + 4 + 57 + 540 + 61 + 1 = 666.

It is not a de Polignac number, because 21457540611 - 2³ = 21457540603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21457540613) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 73233781 + ... + 73234073.

It is an arithmetic number, because the mean of its divisors is an integer number (477692670).

Almost surely, 2^21457540611 is an apocalyptic number.

21457540611 is a deficient number, since it is larger than the sum of its proper divisors (12936331629).

21457540611 is a wasteful number, since it uses less digits than its factorization.

21457540611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 21457540611 in words is "twenty-one billion, four hundred fifty-seven million, five hundred forty thousand, six hundred eleven".