121642231 has 4 divisors (see below), whose sum is σ = 121678200. Its totient is φ = 121606264.

The previous prime is 121642223. The next prime is 121642243. The reversal of 121642231 is 132246121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132246121 = 7 ⋅18892303.

It is a cyclic number.

It is not a de Polignac number, because 121642231 - 2³ = 121642223 is a prime.

It is a super-2 number, since 2×121642231² = 29593664725314722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121642291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12316 + ... + 19873.

It is an arithmetic number, because the mean of its divisors is an integer number (30419550).

Almost surely, 2^121642231 is an apocalyptic number.

121642231 is a deficient number, since it is larger than the sum of its proper divisors (35969).

121642231 is an equidigital number, since it uses as much as digits as its factorization.

121642231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35968.

The product of its digits is 576, while the sum is 22.

The square root of 121642231 is about 11029.1536846668. The cubic root of 121642231 is about 495.4822779834.

Adding to 121642231 its reverse (132246121), we get a palindrome (253888352).

The spelling of 121642231 in words is "one hundred twenty-one million, six hundred forty-two thousand, two hundred thirty-one".