1220138950801 has 3 divisors (see below), whose sum is σ = 1220140055401. Its totient is φ = 1220137846202.

The previous prime is 1220138950799. The next prime is 1220138950843. The reversal of 1220138950801 is 1080598310221.

The square root of 1220138950801 is 1104599.

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 is not a de Polignac number, because 1220138950801 - 2¹ = 1220138950799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220138950601) 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, 552300 + ... + 1656898.

Almost surely, 2^{1220138950801} is an apocalyptic number.

1220138950801 is the 1104599-th square number.

1220138950801 is the 552300-th centered octagonal number.

It is an amenable number.

1220138950801 is a deficient number, since it is larger than the sum of its proper divisors (1104600).

1220138950801 is an frugal number, since it uses more digits than its factorization.

1220138950801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209198 (or 1104599 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 1220138950801 in words is "one trillion, two hundred twenty billion, one hundred thirty-eight million, nine hundred fifty thousand, eight hundred one".