21457496750 has 32 divisors (see below), whose sum is σ = 40182412608. Its totient is φ = 8580012000.

The previous prime is 21457496647. The next prime is 21457496759. The reversal of 21457496750 is 5769475412.

It is a happy number.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21457496759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 791927 + ... + 818573.

It is an arithmetic number, because the mean of its divisors is an integer number (1255700394).

Almost surely, 2^21457496750 is an apocalyptic number.

21457496750 is a deficient number, since it is larger than the sum of its proper divisors (18724915858).

21457496750 is a wasteful number, since it uses less digits than its factorization.

21457496750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29885 (or 29875 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 21457496750 in words is "twenty-one billion, four hundred fifty-seven million, four hundred ninety-six thousand, seven hundred fifty".