136621143721 has 16 divisors (see below), whose sum is σ = 143181479808. Its totient is φ = 130113244800.

The previous prime is 136621143683. The next prime is 136621143797. The reversal of 136621143721 is 127341126631.

It is a happy number.

It is not a de Polignac number, because 136621143721 - 2¹³ = 136621135529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136621143821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8917750 + ... + 8933056.

It is an arithmetic number, because the mean of its divisors is an integer number (8948842488).

Almost surely, 2^136621143721 is an apocalyptic number.

It is an amenable number.

136621143721 is a deficient number, since it is larger than the sum of its proper divisors (6560336087).

136621143721 is a wasteful number, since it uses less digits than its factorization.

136621143721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16992.

The product of its digits is 36288, while the sum is 37.

The spelling of 136621143721 in words is "one hundred thirty-six billion, six hundred twenty-one million, one hundred forty-three thousand, seven hundred twenty-one".