123243352102021 has 4 divisors (see below), whose sum is σ = 127218944105344. Its totient is φ = 119267760098700.

The previous prime is 123243352101943. The next prime is 123243352102033. The reversal of 123243352102021 is 120201253342321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123243352102021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 3975592003291 = 123243352102021 / (1 + 2 + 3 + 2 + 4 + 3 + 3 + 5 + 2 + 1 + 0 + 2 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123243352105021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987796001615 + ... + 1987796001676.

It is an arithmetic number, because the mean of its divisors is an integer number (31804736026336).

Almost surely, 2^{123243352102021} is an apocalyptic number.

It is an amenable number.

123243352102021 is a deficient number, since it is larger than the sum of its proper divisors (3975592003323).

123243352102021 is an equidigital number, since it uses as much as digits as its factorization.

123243352102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975592003322.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 123243352102021 in words is "one hundred twenty-three trillion, two hundred forty-three billion, three hundred fifty-two million, one hundred two thousand, twenty-one".