1257221612 has 24 divisors (see below), whose sum is σ = 2249565696. Its totient is φ = 614519888.

The previous prime is 1257221593. The next prime is 1257221677. The reversal of 1257221612 is 2161227521.

It is a happy number.

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, 181403 + ... + 188205.

It is an arithmetic number, because the mean of its divisors is an integer number (93731904).

Almost surely, 2^1257221612 is an apocalyptic number.

It is an amenable number.

1257221612 is a deficient number, since it is larger than the sum of its proper divisors (992344084).

1257221612 is a wasteful number, since it uses less digits than its factorization.

1257221612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7837 (or 7835 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 1257221612 is about 35457.3209929910. The cubic root of 1257221612 is about 1079.2878283810.

The spelling of 1257221612 in words is "one billion, two hundred fifty-seven million, two hundred twenty-one thousand, six hundred twelve".