21715555424330 has 32 divisors (see below), whose sum is σ = 39124054333584. Its totient is φ = 8678212079616.

The previous prime is 21715555424267. The next prime is 21715555424333. The reversal of 21715555424330 is 3342455551712.

It can be written as a sum of positive squares in 8 ways, for example, as 7978517689129 + 13737037735201 = 2824627^2 + 3706351^2 .

It is not an unprimeable number, because it can be changed into a prime (21715555424333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87981974 + ... + 88228446.

Almost surely, 2^{21715555424330} is an apocalyptic number.

21715555424330 is a deficient number, since it is larger than the sum of its proper divisors (17408498909254).

21715555424330 is a wasteful number, since it uses less digits than its factorization.

21715555424330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254570.

The product of its (nonzero) digits is 2520000, while the sum is 47.

The spelling of 21715555424330 in words is "twenty-one trillion, seven hundred fifteen billion, five hundred fifty-five million, four hundred twenty-four thousand, three hundred thirty".