15115430222421 has 4 divisors (see below), whose sum is σ = 20153906963232. Its totient is φ = 10076953481612.

The previous prime is 15115430222351. The next prime is 15115430222521. The reversal of 15115430222421 is 12422203451151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15115430222421 - 2²¹ = 15115428125269 is a prime.

It is a super-2 number, since 2×15115430222421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15115430222521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2519238370401 + ... + 2519238370406.

It is an arithmetic number, because the mean of its divisors is an integer number (5038476740808).

Almost surely, 2^{15115430222421} is an apocalyptic number.

It is an amenable number.

15115430222421 is a deficient number, since it is larger than the sum of its proper divisors (5038476740811).

15115430222421 is an equidigital number, since it uses as much as digits as its factorization.

15115430222421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038476740810.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 15115430222421 its reverse (12422203451151), we get a palindrome (27537633673572).

The spelling of 15115430222421 in words is "fifteen trillion, one hundred fifteen billion, four hundred thirty million, two hundred twenty-two thousand, four hundred twenty-one".