1221201992 has 32 divisors (see below), whose sum is σ = 2318289600. Its totient is φ = 603028800.

The previous prime is 1221201979. The next prime is 1221202007. The reversal of 1221201992 is 2991021221.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 286517 + ... + 290747.

It is an arithmetic number, because the mean of its divisors is an integer number (72446550).

Almost surely, 2^1221201992 is an apocalyptic number.

It is an amenable number.

1221201992 is a deficient number, since it is larger than the sum of its proper divisors (1097087608).

1221201992 is a wasteful number, since it uses less digits than its factorization.

1221201992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677 (or 4673 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1221201992 is about 34945.7006225372. The cubic root of 1221201992 is about 1068.8805341423.

The spelling of 1221201992 in words is "one billion, two hundred twenty-one million, two hundred one thousand, nine hundred ninety-two".