1221158490 has 16 divisors (see below), whose sum is σ = 2930780448. Its totient is φ = 325642256.

The previous prime is 1221158461. The next prime is 1221158503. The reversal of 1221158490 is 948511221.

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, 20352612 + ... + 20352671.

It is an arithmetic number, because the mean of its divisors is an integer number (183173778).

Almost surely, 2^1221158490 is an apocalyptic number.

1221158490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221158490 is an abundant number, since it is smaller than the sum of its proper divisors (1709621958).

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

1221158490 is a wasteful number, since it uses less digits than its factorization.

1221158490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40705293.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1221158490 is about 34945.0781942179. The cubic root of 1221158490 is about 1068.8678420042.

The spelling of 1221158490 in words is "one billion, two hundred twenty-one million, one hundred fifty-eight thousand, four hundred ninety".