136367644721 has 32 divisors (see below), whose sum is σ = 179753886720. Its totient is φ = 100224129600.

The previous prime is 136367644717. The next prime is 136367644723. The reversal of 136367644721 is 127446763631.

It is a happy number.

It is not a de Polignac number, because 136367644721 - 2² = 136367644717 is a prime.

It is a super-2 number, since 2×136367644721² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136367644721.

It is not an unprimeable number, because it can be changed into a prime (136367644723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126791 + ... + 537411.

It is an arithmetic number, because the mean of its divisors is an integer number (5617308960).

Almost surely, 2^136367644721 is an apocalyptic number.

136367644721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136367644721 is a deficient number, since it is larger than the sum of its proper divisors (43386241999).

136367644721 is a wasteful number, since it uses less digits than its factorization.

136367644721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410885.

The product of its digits is 3048192, while the sum is 50.

The spelling of 136367644721 in words is "one hundred thirty-six billion, three hundred sixty-seven million, six hundred forty-four thousand, seven hundred twenty-one".