1221507165701 has 8 divisors (see below), whose sum is σ = 1224171640320. Its totient is φ = 1218845120112.

The previous prime is 1221507165629. The next prime is 1221507165707. The reversal of 1221507165701 is 1075617051221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221507165701 - 2³⁰ = 1220433423877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221507165707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401420 + ... + 1613738.

It is an arithmetic number, because the mean of its divisors is an integer number (153021455040).

Almost surely, 2^{1221507165701} is an apocalyptic number.

It is an amenable number.

1221507165701 is a deficient number, since it is larger than the sum of its proper divisors (2664474619).

1221507165701 is a wasteful number, since it uses less digits than its factorization.

1221507165701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214515.

The product of its (nonzero) digits is 29400, while the sum is 38.

The spelling of 1221507165701 in words is "one trillion, two hundred twenty-one billion, five hundred seven million, one hundred sixty-five thousand, seven hundred one".