123020131211 has 4 divisors (see below), whose sum is σ = 128368832592. Its totient is φ = 117671429832.

The previous prime is 123020131189. The next prime is 123020131217. The reversal of 123020131211 is 112131020321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112131020321 = 43 ⋅2607698147.

It is a cyclic number.

It is not a de Polignac number, because 123020131211 - 2⁶ = 123020131147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123020131211.

It is not an unprimeable number, because it can be changed into a prime (123020131217) 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, 2674350656 + ... + 2674350701.

It is an arithmetic number, because the mean of its divisors is an integer number (32092208148).

Almost surely, 2^123020131211 is an apocalyptic number.

123020131211 is a deficient number, since it is larger than the sum of its proper divisors (5348701381).

123020131211 is an equidigital number, since it uses as much as digits as its factorization.

123020131211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348701380.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 123020131211 its reverse (112131020321), we get a palindrome (235151151532).

The spelling of 123020131211 in words is "one hundred twenty-three billion, twenty million, one hundred thirty-one thousand, two hundred eleven".