1221131504 has 10 divisors (see below), whose sum is σ = 2365942320. Its totient is φ = 610565744.

The previous prime is 1221131497. The next prime is 1221131533. The reversal of 1221131504 is 4051311221.

It is a super-2 number, since 2×1221131504² = 2982324300122604032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38160344 + ... + 38160375.

It is an arithmetic number, because the mean of its divisors is an integer number (236594232).

Almost surely, 2^1221131504 is an apocalyptic number.

It is an amenable number.

1221131504 is a deficient number, since it is larger than the sum of its proper divisors (1144810816).

1221131504 is an equidigital number, since it uses as much as digits as its factorization.

1221131504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76320727 (or 76320721 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1221131504 is about 34944.6920719013. The cubic root of 1221131504 is about 1068.8599684207.

Adding to 1221131504 its reverse (4051311221), we get a palindrome (5272442725).

The spelling of 1221131504 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, five hundred four".