136842021 has 16 divisors (see below), whose sum is σ = 208209600. Its totient is φ = 88761744.

The previous prime is 136842001. The next prime is 136842037. The reversal of 136842021 is 120248631.

It is not a de Polignac number, because 136842021 - 2⁷ = 136841893 is a prime.

It is a super-2 number, since 2×136842021² = 37451477422728882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136842001) 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, 67491 + ... + 69488.

It is an arithmetic number, because the mean of its divisors is an integer number (13013100).

Almost surely, 2^136842021 is an apocalyptic number.

It is an amenable number.

136842021 is a deficient number, since it is larger than the sum of its proper divisors (71367579).

136842021 is a wasteful number, since it uses less digits than its factorization.

136842021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137025 (or 137019 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 136842021 is about 11697.9494356917. The cubic root of 136842021 is about 515.3154456680.

The spelling of 136842021 in words is "one hundred thirty-six million, eight hundred forty-two thousand, twenty-one".