36561214421 has 2 divisors, whose sum is σ = 36561214422. Its totient is φ = 36561214420.

The previous prime is 36561214411. The next prime is 36561214439. The reversal of 36561214421 is 12441216563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24020350225 + 12540864196 = 154985^2 + 111986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36561214421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36561214411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18280607210 + 18280607211.

It is an arithmetic number, because the mean of its divisors is an integer number (18280607211).

Almost surely, 2^36561214421 is an apocalyptic number.

It is an amenable number.

36561214421 is a deficient number, since it is larger than the sum of its proper divisors (1).

36561214421 is an equidigital number, since it uses as much as digits as its factorization.

36561214421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The spelling of 36561214421 in words is "thirty-six billion, five hundred sixty-one million, two hundred fourteen thousand, four hundred twenty-one".