1220321131 has 16 divisors (see below), whose sum is σ = 1308117600. Its totient is φ = 1136332288.

The previous prime is 1220321101. The next prime is 1220321177. The reversal of 1220321131 is 1311230221.

It is not a de Polignac number, because 1220321131 - 2¹³ = 1220312939 is a prime.

It is a super-2 number, since 2×1220321131² = 2978367325530238322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220321101) 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, 83955 + ... + 97411.

It is an arithmetic number, because the mean of its divisors is an integer number (81757350).

Almost surely, 2^1220321131 is an apocalyptic number.

1220321131 is a deficient number, since it is larger than the sum of its proper divisors (87796469).

1220321131 is a wasteful number, since it uses less digits than its factorization.

1220321131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13598.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220321131 is about 34933.0950675717. The cubic root of 1220321131 is about 1068.6234754817.

Adding to 1220321131 its reverse (1311230221), we get a palindrome (2531551352).

The spelling of 1220321131 in words is "one billion, two hundred twenty million, three hundred twenty-one thousand, one hundred thirty-one".