1221989132 has 24 divisors (see below), whose sum is σ = 2631977376. Its totient is φ = 483424128.

The previous prime is 1221989129. The next prime is 1221989137. The reversal of 1221989132 is 2319891221.

It is a super-2 number, since 2×1221989132² = 2986514877452226848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1221989137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1678193 + ... + 1678920.

It is an arithmetic number, because the mean of its divisors is an integer number (109665724).

Almost surely, 2^1221989132 is an apocalyptic number.

It is an amenable number.

1221989132 is an abundant number, since it is smaller than the sum of its proper divisors (1409988244).

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

1221989132 is a wasteful number, since it uses less digits than its factorization.

1221989132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3357137 (or 3357135 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 1221989132 is about 34956.9611379479. The cubic root of 1221989132 is about 1069.1101379602.

The spelling of 1221989132 in words is "one billion, two hundred twenty-one million, nine hundred eighty-nine thousand, one hundred thirty-two".