222125421 has 32 divisors (see below), whose sum is σ = 354705408. Its totient is φ = 120890880.

The previous prime is 222125419. The next prime is 222125429. The reversal of 222125421 is 124521222.

It is not a de Polignac number, because 222125421 - 2¹ = 222125419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222125429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130045 + ... + 131741.

It is an arithmetic number, because the mean of its divisors is an integer number (11084544).

Almost surely, 2^222125421 is an apocalyptic number.

222125421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222125421 is a deficient number, since it is larger than the sum of its proper divisors (132579987).

222125421 is a wasteful number, since it uses less digits than its factorization.

222125421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001.

The product of its digits is 640, while the sum is 21.

The square root of 222125421 is about 14903.8726846414. The cubic root of 222125421 is about 605.6189017567.

Adding to 222125421 its reverse (124521222), we get a palindrome (346646643).

The spelling of 222125421 in words is "two hundred twenty-two million, one hundred twenty-five thousand, four hundred twenty-one".