15140564221 has 2 divisors, whose sum is σ = 15140564222. Its totient is φ = 15140564220.

The previous prime is 15140564203. The next prime is 15140564233. The reversal of 15140564221 is 12246504151.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14017376025 + 1123188196 = 118395^2 + 33514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15140564221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15140565221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7570282110 + 7570282111.

It is an arithmetic number, because the mean of its divisors is an integer number (7570282111).

Almost surely, 2^15140564221 is an apocalyptic number.

It is an amenable number.

15140564221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15140564221 is an equidigital number, since it uses as much as digits as its factorization.

15140564221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 15140564221 in words is "fifteen billion, one hundred forty million, five hundred sixty-four thousand, two hundred twenty-one".