1221121092 has 24 divisors (see below), whose sum is σ = 2849962752. Its totient is φ = 406943200.

The previous prime is 1221121073. The next prime is 1221121117. The reversal of 1221121092 is 2901211221.

It is a super-2 number, since 2×1221121092² = 2982273442654544928, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55117 + ... + 74027.

It is an arithmetic number, because the mean of its divisors is an integer number (118748448).

Almost surely, 2^1221121092 is an apocalyptic number.

1221121092 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221121092 is an abundant number, since it is smaller than the sum of its proper divisors (1628841660).

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

1221121092 is a wasteful number, since it uses less digits than its factorization.

1221121092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24299 (or 24297 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1221121092 is about 34944.5430933071. The cubic root of 1221121092 is about 1068.8569305274.

The spelling of 1221121092 in words is "one billion, two hundred twenty-one million, one hundred twenty-one thousand, ninety-two".