15220421131 has 2 divisors, whose sum is σ = 15220421132. Its totient is φ = 15220421130.

The previous prime is 15220421129. The next prime is 15220421221. The reversal of 15220421131 is 13112402251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15220421131 - 2¹ = 15220421129 is a prime.

It is a super-2 number, since 2×15220421131² (a number of 21 digits) contains 22 as substring.

Together with 15220421129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15220428131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610210565 + 7610210566.

It is an arithmetic number, because the mean of its divisors is an integer number (7610210566).

Almost surely, 2^15220421131 is an apocalyptic number.

15220421131 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220421131 is an equidigital number, since it uses as much as digits as its factorization.

15220421131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 15220421131 its reverse (13112402251), we get a palindrome (28332823382).

The spelling of 15220421131 in words is "fifteen billion, two hundred twenty million, four hundred twenty-one thousand, one hundred thirty-one".