136996821 has 24 divisors (see below), whose sum is σ = 224325920. Its totient is φ = 79867296.

The previous prime is 136996819. The next prime is 136996861. The reversal of 136996821 is 128699631.

It is a happy number.

136996821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 136996821 - 2¹ = 136996819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136996861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28591 + ... + 33036.

Almost surely, 2^136996821 is an apocalyptic number.

It is an amenable number.

136996821 is a deficient number, since it is larger than the sum of its proper divisors (87329099).

136996821 is a wasteful number, since it uses less digits than its factorization.

136996821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61665 (or 61662 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 136996821 is about 11704.5641097821. The cubic root of 136996821 is about 515.5096861251.

The spelling of 136996821 in words is "one hundred thirty-six million, nine hundred ninety-six thousand, eight hundred twenty-one".