15214561621 has 16 divisors (see below), whose sum is σ = 18417646080. Its totient is φ = 12269433600.

The previous prime is 15214561577. The next prime is 15214561631. The reversal of 15214561621 is 12616541251.

It is a cyclic number.

It is not a de Polignac number, because 15214561621 - 2⁷ = 15214561493 is a prime.

It is a super-2 number, since 2×15214561621² (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 (15214561631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324196 + ... + 368146.

It is an arithmetic number, because the mean of its divisors is an integer number (1151102880).

Almost surely, 2^15214561621 is an apocalyptic number.

It is an amenable number.

15214561621 is a deficient number, since it is larger than the sum of its proper divisors (3203084459).

15214561621 is a wasteful number, since it uses less digits than its factorization.

15214561621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46884.

The product of its digits is 14400, while the sum is 34.

The spelling of 15214561621 in words is "fifteen billion, two hundred fourteen million, five hundred sixty-one thousand, six hundred twenty-one".