15857353222221 has 32 divisors (see below), whose sum is σ = 24294962976768. Its totient is φ = 9012111312960.

The previous prime is 15857353222199. The next prime is 15857353222267. The reversal of 15857353222221 is 12222235375851.

It is not a de Polignac number, because 15857353222221 - 2³⁹ = 15307597408333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15857353222421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10859686 + ... + 12233048.

It is an arithmetic number, because the mean of its divisors is an integer number (759217593024).

Almost surely, 2^{15857353222221} is an apocalyptic number.

It is an amenable number.

15857353222221 is a deficient number, since it is larger than the sum of its proper divisors (8437609754547).

15857353222221 is a wasteful number, since it uses less digits than its factorization.

15857353222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376361.

The product of its digits is 2016000, while the sum is 48.

The spelling of 15857353222221 in words is "fifteen trillion, eight hundred fifty-seven billion, three hundred fifty-three million, two hundred twenty-two thousand, two hundred twenty-one".