136621664421 has 8 divisors (see below), whose sum is σ = 198722421024. Its totient is φ = 82801008720.

The previous prime is 136621664401. The next prime is 136621664453. The reversal of 136621664421 is 124466126631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 136621664421 - 2⁷ = 136621664293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136621664401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2070025186 + ... + 2070025251.

It is an arithmetic number, because the mean of its divisors is an integer number (24840302628).

Almost surely, 2^136621664421 is an apocalyptic number.

136621664421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136621664421 is a deficient number, since it is larger than the sum of its proper divisors (62100756603).

136621664421 is a wasteful number, since it uses less digits than its factorization.

136621664421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140050451.

The product of its digits is 248832, while the sum is 42.

The spelling of 136621664421 in words is "one hundred thirty-six billion, six hundred twenty-one million, six hundred sixty-four thousand, four hundred twenty-one".