27615131253421 has 2 divisors, whose sum is σ = 27615131253422. Its totient is φ = 27615131253420.

The previous prime is 27615131253401. The next prime is 27615131253553. The reversal of 27615131253421 is 12435213151672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19868316697321 + 7746814556100 = 4457389^2 + 2783310^2 .

It is a cyclic number.

It is not a de Polignac number, because 27615131253421 - 2⁷ = 27615131253293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27615131253401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13807565626710 + 13807565626711.

It is an arithmetic number, because the mean of its divisors is an integer number (13807565626711).

Almost surely, 2^{27615131253421} is an apocalyptic number.

It is an amenable number.

27615131253421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27615131253421 is an equidigital number, since it uses as much as digits as its factorization.

27615131253421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 43.

The spelling of 27615131253421 in words is "twenty-seven trillion, six hundred fifteen billion, one hundred thirty-one million, two hundred fifty-three thousand, four hundred twenty-one".