1221167996 has 24 divisors (see below), whose sum is σ = 2238921216. Its totient is φ = 582064560.

The previous prime is 1221167977. The next prime is 1221167999. The reversal of 1221167996 is 6997611221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221167999) 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, 65186 + ... + 81801.

It is an arithmetic number, because the mean of its divisors is an integer number (93288384).

Almost surely, 2^1221167996 is an apocalyptic number.

It is an amenable number.

1221167996 is a deficient number, since it is larger than the sum of its proper divisors (1017753220).

1221167996 is a wasteful number, since it uses less digits than its factorization.

1221167996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147089 (or 147087 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 1221167996 is about 34945.2142073847. The cubic root of 1221167996 is about 1068.8706154993.

The spelling of 1221167996 in words is "one billion, two hundred twenty-one million, one hundred sixty-seven thousand, nine hundred ninety-six".