136421121 has 16 divisors (see below), whose sum is σ = 192456000. Its totient is φ = 85716288.

The previous prime is 136421113. The next prime is 136421123. The reversal of 136421121 is 121124631.

It is not a de Polignac number, because 136421121 - 2³ = 136421113 is a prime.

It is a super-2 number, since 2×136421121² = 37221444509793282, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136421123) 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, 5155 + ... + 17303.

It is an arithmetic number, because the mean of its divisors is an integer number (12028500).

Almost surely, 2^136421121 is an apocalyptic number.

It is an amenable number.

136421121 is a deficient number, since it is larger than the sum of its proper divisors (56034879).

136421121 is a wasteful number, since it uses less digits than its factorization.

136421121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12368.

The product of its digits is 288, while the sum is 21.

The square root of 136421121 is about 11679.9452481593. The cubic root of 136421121 is about 514.7865656561.

Adding to 136421121 its reverse (121124631), we get a palindrome (257545752).

The spelling of 136421121 in words is "one hundred thirty-six million, four hundred twenty-one thousand, one hundred twenty-one".