21355074325 has 12 divisors (see below), whose sum is σ = 28517238148. Its totient is φ = 15769900800.

The previous prime is 21355074277. The next prime is 21355074329. The reversal of 21355074325 is 52347055312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4266833041 + 17088241284 = 65321^2 + 130722^2 .

It is not a de Polignac number, because 21355074325 - 2¹³ = 21355066133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355074329) 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, 32853636 + ... + 32854285.

Almost surely, 2^21355074325 is an apocalyptic number.

21355074325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21355074325 is a deficient number, since it is larger than the sum of its proper divisors (7162163823).

21355074325 is a wasteful number, since it uses less digits than its factorization.

21355074325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65707944 (or 65707939 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 21355074325 in words is "twenty-one billion, three hundred fifty-five million, seventy-four thousand, three hundred twenty-five".