21481270500 has 48 divisors (see below), whose sum is σ = 62553464064. Its totient is φ = 5728338400.

The previous prime is 21481270487. The next prime is 21481270511. The reversal of 21481270500 is 507218412.

It is a super-2 number, since 2×21481270500² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7158924 + ... + 7161923.

It is an arithmetic number, because the mean of its divisors is an integer number (1303197168).

Almost surely, 2^21481270500 is an apocalyptic number.

21481270500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21481270500 is an abundant number, since it is smaller than the sum of its proper divisors (41072193564).

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

21481270500 is a wasteful number, since it uses less digits than its factorization.

21481270500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14320869 (or 14320857 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

Adding to 21481270500 its reverse (507218412), we get a palindrome (21988488912).

The spelling of 21481270500 in words is "twenty-one billion, four hundred eighty-one million, two hundred seventy thousand, five hundred".