1320175722121 has 3 divisors (see below), whose sum is σ = 1320176871111. Its totient is φ = 1320174573132.

The previous prime is 1320175722101. The next prime is 1320175722139. The reversal of 1320175722121 is 1212275710231.

The square root of 1320175722121 is 1148989.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 337341417721 + 982834304400 = 580811^2 + 991380^2 .

It is not a de Polignac number, because 1320175722121 - 2¹⁵ = 1320175689353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320175722101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 574495 + ... + 1723483.

It is an arithmetic number, because the mean of its divisors is an integer number (440058957037).

Almost surely, 2^{1320175722121} is an apocalyptic number.

1320175722121 is the 1148989-th square number.

1320175722121 is the 574495-th centered octagonal number.

It is an amenable number.

1320175722121 is a deficient number, since it is larger than the sum of its proper divisors (1148990).

1320175722121 is an frugal number, since it uses more digits than its factorization.

1320175722121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297978 (or 1148989 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 1320175722121 in words is "one trillion, three hundred twenty billion, one hundred seventy-five million, seven hundred twenty-two thousand, one hundred twenty-one".