36213565121 has 4 divisors (see below), whose sum is σ = 38343774852. Its totient is φ = 34083355392.

The previous prime is 36213565099. The next prime is 36213565217. The reversal of 36213565121 is 12156531263.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12156531263 = 37 ⋅328554899.

It can be written as a sum of positive squares in 2 ways, for example, as 30462466225 + 5751098896 = 174535^2 + 75836^2 .

It is a cyclic number.

It is not a de Polignac number, because 36213565121 - 2²² = 36209370817 is a prime.

It is a super-2 number, since 2×36213565121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36212565121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065104840 + ... + 1065104873.

It is an arithmetic number, because the mean of its divisors is an integer number (9585943713).

Almost surely, 2^36213565121 is an apocalyptic number.

It is an amenable number.

36213565121 is a deficient number, since it is larger than the sum of its proper divisors (2130209731).

36213565121 is a wasteful number, since it uses less digits than its factorization.

36213565121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130209730.

The product of its digits is 32400, while the sum is 35.

The spelling of 36213565121 in words is "thirty-six billion, two hundred thirteen million, five hundred sixty-five thousand, one hundred twenty-one".