1220123021231 has 4 divisors (see below), whose sum is σ = 1220241870792. Its totient is φ = 1220004171672.

The previous prime is 1220123021177. The next prime is 1220123021233. The reversal of 1220123021231 is 1321203210221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220123021231 - 2¹⁸ = 1220122759087 is a prime.

It is a super-2 number, since 2×1220123021231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220123021233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59409380 + ... + 59429913.

It is an arithmetic number, because the mean of its divisors is an integer number (305060467698).

Almost surely, 2^{1220123021231} is an apocalyptic number.

1220123021231 is a deficient number, since it is larger than the sum of its proper divisors (118849561).

1220123021231 is a wasteful number, since it uses less digits than its factorization.

1220123021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118849560.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1220123021231 its reverse (1321203210221), we get a palindrome (2541326231452).

The spelling of 1220123021231 in words is "one trillion, two hundred twenty billion, one hundred twenty-three million, twenty-one thousand, two hundred thirty-one".