21503484625 has 64 divisors (see below), whose sum is σ = 31889894400. Its totient is φ = 14465505600.

The previous prime is 21503484571. The next prime is 21503484641. The reversal of 21503484625 is 52648430512.

It is not a de Polignac number, because 21503484625 - 2²¹ = 21501387473 is a prime.

It is a super-2 number, since 2×21503484625² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2267644 + ... + 2277106.

It is an arithmetic number, because the mean of its divisors is an integer number (498279600).

Almost surely, 2^21503484625 is an apocalyptic number.

21503484625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21503484625 is a deficient number, since it is larger than the sum of its proper divisors (10386409775).

21503484625 is an frugal number, since it uses more digits than its factorization.

21503484625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9552 (or 9528 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 21503484625 in words is "twenty-one billion, five hundred three million, four hundred eighty-four thousand, six hundred twenty-five".