221665253077412 has 12 divisors (see below), whose sum is σ = 398398360261020. Its totient is φ = 107837150145696.

The previous prime is 221665253077363. The next prime is 221665253077423. The reversal of 221665253077412 is 214770352566122.

It is a happy number.

221665253077412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 194375348724736 + 27289904352676 = 13941856^2 + 5223974^2 .

It is a super-2 number, since 2×221665253077412² (a number of 29 digits) contains 22 as substring.

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, 748869098087 + ... + 748869098382.

It is an arithmetic number, because the mean of its divisors is an integer number (33199863355085).

Almost surely, 2^{221665253077412} is an apocalyptic number.

It is an amenable number.

221665253077412 is a deficient number, since it is larger than the sum of its proper divisors (176733107183608).

221665253077412 is a wasteful number, since it uses less digits than its factorization.

221665253077412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497738196510 (or 1497738196508 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 53.

The spelling of 221665253077412 in words is "two hundred twenty-one trillion, six hundred sixty-five billion, two hundred fifty-three million, seventy-seven thousand, four hundred twelve".