220421131 has 4 divisors (see below), whose sum is σ = 251909872. Its totient is φ = 188932392.

The previous prime is 220421111. The next prime is 220421153. The reversal of 220421131 is 131124022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220421131 - 2¹⁹ = 219896843 is a prime.

It is a super-2 number, since 2×220421131² = 97170949982638322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220421111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15744360 + ... + 15744373.

It is an arithmetic number, because the mean of its divisors is an integer number (62977468).

Almost surely, 2^220421131 is an apocalyptic number.

220421131 is a deficient number, since it is larger than the sum of its proper divisors (31488741).

220421131 is an equidigital number, since it uses as much as digits as its factorization.

220421131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31488740.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 220421131 is about 14846.5865100366. The cubic root of 220421131 is about 604.0660233296.

Adding to 220421131 its reverse (131124022), we get a palindrome (351545153).

The spelling of 220421131 in words is "two hundred twenty million, four hundred twenty-one thousand, one hundred thirty-one".