36221937881 has 2 divisors, whose sum is σ = 36221937882. Its totient is φ = 36221937880.

The previous prime is 36221937853. The next prime is 36221937901. The reversal of 36221937881 is 18873912263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35632225225 + 589712656 = 188765^2 + 24284^2 .

It is a cyclic number.

It is not a de Polignac number, because 36221937881 - 2³⁴ = 19042068697 is a prime.

It is a super-2 number, since 2×36221937881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (36221957881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18110968940 + 18110968941.

It is an arithmetic number, because the mean of its divisors is an integer number (18110968941).

Almost surely, 2^36221937881 is an apocalyptic number.

It is an amenable number.

36221937881 is a deficient number, since it is larger than the sum of its proper divisors (1).

36221937881 is an equidigital number, since it uses as much as digits as its factorization.

36221937881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The spelling of 36221937881 in words is "thirty-six billion, two hundred twenty-one million, nine hundred thirty-seven thousand, eight hundred eighty-one".