1221252996 has 24 divisors (see below), whose sum is σ = 2850853824. Its totient is φ = 406903840.

The previous prime is 1221252979. The next prime is 1221252997. The reversal of 1221252996 is 6992521221.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1221252997) 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, 7201 + ... + 49943.

It is an arithmetic number, because the mean of its divisors is an integer number (118785576).

Almost surely, 2^1221252996 is an apocalyptic number.

It is an amenable number.

1221252996 is an abundant number, since it is smaller than the sum of its proper divisors (1629600828).

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

1221252996 is a wasteful number, since it uses less digits than its factorization.

1221252996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45131 (or 45129 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 1221252996 is about 34946.4303756478. The cubic root of 1221252996 is about 1068.8954146792.

The spelling of 1221252996 in words is "one billion, two hundred twenty-one million, two hundred fifty-two thousand, nine hundred ninety-six".