220031421 has 4 divisors (see below), whose sum is σ = 293375232. Its totient is φ = 146687612.

The previous prime is 220031411. The next prime is 220031431. The reversal of 220031421 is 124130022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (220031411) and next prime (220031431).

It is a cyclic number.

It is not a de Polignac number, because 220031421 - 2⁵ = 220031389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220031421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220031401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36671901 + ... + 36671906.

It is an arithmetic number, because the mean of its divisors is an integer number (73343808).

Almost surely, 2^220031421 is an apocalyptic number.

It is an amenable number.

220031421 is a deficient number, since it is larger than the sum of its proper divisors (73343811).

220031421 is an equidigital number, since it uses as much as digits as its factorization.

220031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73343810.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 220031421 is about 14833.4561380684. The cubic root of 220031421 is about 603.7098121041.

Adding to 220031421 its reverse (124130022), we get a palindrome (344161443).

The spelling of 220031421 in words is "two hundred twenty million, thirty-one thousand, four hundred twenty-one".