1221311092 has 48 divisors (see below), whose sum is σ = 2268080640. Its totient is φ = 574617600.

The previous prime is 1221311081. The next prime is 1221311107. The reversal of 1221311092 is 2901131221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 708792 + ... + 710512.

It is an arithmetic number, because the mean of its divisors is an integer number (47251680).

Almost surely, 2^1221311092 is an apocalyptic number.

It is an amenable number.

1221311092 is a deficient number, since it is larger than the sum of its proper divisors (1046769548).

1221311092 is a wasteful number, since it uses less digits than its factorization.

1221311092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912 (or 1910 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1221311092 is about 34947.2615808449. The cubic root of 1221311092 is about 1068.9123638190.

The spelling of 1221311092 in words is "one billion, two hundred twenty-one million, three hundred eleven thousand, ninety-two".