21457540550 has 12 divisors (see below), whose sum is σ = 39911025516. Its totient is φ = 8583016200.

The previous prime is 21457540549. The next prime is 21457540561. The reversal of 21457540550 is 5504575412.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214575356 + ... + 214575455.

It is an arithmetic number, because the mean of its divisors is an integer number (3325918793).

Almost surely, 2^21457540550 is an apocalyptic number.

21457540550 is a deficient number, since it is larger than the sum of its proper divisors (18453484966).

21457540550 is a wasteful number, since it uses less digits than its factorization.

21457540550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429150823 (or 429150818 counting only the distinct ones).

The product of its (nonzero) digits is 140000, while the sum is 38.

The spelling of 21457540550 in words is "twenty-one billion, four hundred fifty-seven million, five hundred forty thousand, five hundred fifty".