121431021 has 8 divisors (see below), whose sum is σ = 161962080. Its totient is φ = 80926992.

The previous prime is 121431019. The next prime is 121431031. The reversal of 121431021 is 120134121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121431021 - 2¹ = 121431019 is a prime.

It is a super-2 number, since 2×121431021² = 29490985722204882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121431031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8935 + ... + 17963.

It is an arithmetic number, because the mean of its divisors is an integer number (20245260).

Almost surely, 2^121431021 is an apocalyptic number.

It is an amenable number.

121431021 is a deficient number, since it is larger than the sum of its proper divisors (40531059).

121431021 is an equidigital number, since it uses as much as digits as its factorization.

121431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13515.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 121431021 is about 11019.5744473187. The cubic root of 121431021 is about 495.1953396980.

Adding to 121431021 its reverse (120134121), we get a palindrome (241565142).

The spelling of 121431021 in words is "one hundred twenty-one million, four hundred thirty-one thousand, twenty-one".