21222540625 has 48 divisors (see below), whose sum is σ = 31164630336. Its totient is φ = 14247000000.

The previous prime is 21222540601. The next prime is 21222540659. The reversal of 21222540625 is 52604522212.

It is not a de Polignac number, because 21222540625 - 2⁵ = 21222540593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 423130 + ... + 470620.

It is an arithmetic number, because the mean of its divisors is an integer number (649263132).

Almost surely, 2^21222540625 is an apocalyptic number.

21222540625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21222540625 is a deficient number, since it is larger than the sum of its proper divisors (9942089711).

21222540625 is an equidigital number, since it uses as much as digits as its factorization.

21222540625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47540 (or 47520 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 21222540625 in words is "twenty-one billion, two hundred twenty-two million, five hundred forty thousand, six hundred twenty-five".