1272221516 has 12 divisors (see below), whose sum is σ = 2256886632. Its totient is φ = 627396768.

The previous prime is 1272221507. The next prime is 1272221549. The reversal of 1272221516 is 6151222721.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2178170 + ... + 2178753.

It is an arithmetic number, because the mean of its divisors is an integer number (188073886).

Almost surely, 2^1272221516 is an apocalyptic number.

It is an amenable number.

1272221516 is a deficient number, since it is larger than the sum of its proper divisors (984665116).

1272221516 is a wasteful number, since it uses less digits than its factorization.

1272221516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357000 (or 4356998 counting only the distinct ones).

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

The square root of 1272221516 is about 35668.2143651739. The cubic root of 1272221516 is about 1083.5631957423.

The spelling of 1272221516 in words is "one billion, two hundred seventy-two million, two hundred twenty-one thousand, five hundred sixteen".