1221708708 has 36 divisors (see below), whose sum is σ = 3368955408. Its totient is φ = 370214640.

The previous prime is 1221708703. The next prime is 1221708713. The reversal of 1221708708 is 8078071221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221708703) and next prime (1221708713).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1221708703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1542166 + ... + 1542957.

Almost surely, 2^1221708708 is an apocalyptic number.

1221708708 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1221708708 is an abundant number, since it is smaller than the sum of its proper divisors (2147246700).

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

1221708708 is a wasteful number, since it uses less digits than its factorization.

1221708708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085144 (or 3085139 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 1221708708 is about 34952.9499184261. The cubic root of 1221708708 is about 1069.0283513415.

Adding to 1221708708 its reverse (8078071221), we get a palindrome (9299779929).

The spelling of 1221708708 in words is "one billion, two hundred twenty-one million, seven hundred eight thousand, seven hundred eight".