15312202421 has 8 divisors (see below), whose sum is σ = 15439663104. Its totient is φ = 15184849680.

The previous prime is 15312202369. The next prime is 15312202439. The reversal of 15312202421 is 12420221351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15312202421 - 2²⁶ = 15245093557 is a prime.

It is a super-2 number, since 2×15312202421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15312202441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271556 + ... + 323058.

It is an arithmetic number, because the mean of its divisors is an integer number (1929957888).

Almost surely, 2^15312202421 is an apocalyptic number.

It is an amenable number.

15312202421 is a deficient number, since it is larger than the sum of its proper divisors (127460683).

15312202421 is a wasteful number, since it uses less digits than its factorization.

15312202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53971.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 15312202421 its reverse (12420221351), we get a palindrome (27732423772).

The spelling of 15312202421 in words is "fifteen billion, three hundred twelve million, two hundred two thousand, four hundred twenty-one".