421438121 has 16 divisors (see below), whose sum is σ = 477489600. Its totient is φ = 369219648.

The previous prime is 421438067. The next prime is 421438123. The reversal of 421438121 is 121834124.

It is not a de Polignac number, because 421438121 - 2¹⁰ = 421437097 is a prime.

It is a super-2 number, since 2×421438121² = 355220179664021282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421438123) 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, 12770 + ... + 31716.

It is an arithmetic number, because the mean of its divisors is an integer number (29843100).

Almost surely, 2^421438121 is an apocalyptic number.

It is an amenable number.

421438121 is a deficient number, since it is larger than the sum of its proper divisors (56051479).

421438121 is a wasteful number, since it uses less digits than its factorization.

421438121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19048.

The product of its digits is 1536, while the sum is 26.

The square root of 421438121 is about 20528.9581079995. The cubic root of 421438121 is about 749.7410193230.

The spelling of 421438121 in words is "four hundred twenty-one million, four hundred thirty-eight thousand, one hundred twenty-one".