1221704996 has 6 divisors (see below), whose sum is σ = 2137983750. Its totient is φ = 610852496.

The previous prime is 1221704993. The next prime is 1221705029. The reversal of 1221704996 is 6994071221.

It can be written as a sum of positive squares in only one way, i.e., 731702500 + 490002496 = 27050^2 + 22136^2 .

It is not an unprimeable number, because it can be changed into a prime (1221704993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152713121 + ... + 152713128.

It is an arithmetic number, because the mean of its divisors is an integer number (356330625).

Almost surely, 2^1221704996 is an apocalyptic number.

It is an amenable number.

1221704996 is a deficient number, since it is larger than the sum of its proper divisors (916278754).

1221704996 is a wasteful number, since it uses less digits than its factorization.

1221704996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305426253 (or 305426251 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1221704996 is about 34952.8968184327. The cubic root of 1221704996 is about 1069.0272686401.

The spelling of 1221704996 in words is "one billion, two hundred twenty-one million, seven hundred four thousand, nine hundred ninety-six".