1221131202 has 16 divisors (see below), whose sum is σ = 2508269952. Its totient is φ = 396042480.

The previous prime is 1221131189. The next prime is 1221131321. The reversal of 1221131202 is 2021311221.

It is a super-2 number, since 2×1221131202² = 2982322824995929608, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2750074 + ... + 2750517.

It is an arithmetic number, because the mean of its divisors is an integer number (156766872).

Almost surely, 2^1221131202 is an apocalyptic number.

1221131202 is an abundant number, since it is smaller than the sum of its proper divisors (1287138750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221131202 is a wasteful number, since it uses less digits than its factorization.

1221131202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500633.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1221131202 is about 34944.6877507870. The cubic root of 1221131202 is about 1068.8598803069.

Adding to 1221131202 its reverse (2021311221), we get a palindrome (3242442423).

The spelling of 1221131202 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred two".