21750427950 has 24 divisors (see below), whose sum is σ = 53941061688. Its totient is φ = 5800114080.

The previous prime is 21750427943. The next prime is 21750427957. The reversal of 21750427950 is 5972405712.

It is an interprime number because it is at equal distance from previous prime (21750427943) and next prime (21750427957).

It is a super-2 number, since 2×21750427950² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21750427957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72501277 + ... + 72501576.

It is an arithmetic number, because the mean of its divisors is an integer number (2247544237).

Almost surely, 2^21750427950 is an apocalyptic number.

21750427950 is an abundant number, since it is smaller than the sum of its proper divisors (32190633738).

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

21750427950 is a wasteful number, since it uses less digits than its factorization.

21750427950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145002868 (or 145002863 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 21750427950 in words is "twenty-one billion, seven hundred fifty million, four hundred twenty-seven thousand, nine hundred fifty".