123111300021 has 16 divisors (see below), whose sum is σ = 168603997248. Its totient is φ = 79846905600.

The previous prime is 123111300007. The next prime is 123111300023. The reversal of 123111300021 is 120003111321.

It is a happy number.

It is not a de Polignac number, because 123111300021 - 2¹⁴ = 123111283637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111300023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 998586 + ... + 1115076.

It is an arithmetic number, because the mean of its divisors is an integer number (10537749828).

Almost surely, 2^123111300021 is an apocalyptic number.

It is an amenable number.

123111300021 is a deficient number, since it is larger than the sum of its proper divisors (45492697227).

123111300021 is a wasteful number, since it uses less digits than its factorization.

123111300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126052.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 123111300021 its reverse (120003111321), we get a palindrome (243114411342).

The spelling of 123111300021 in words is "one hundred twenty-three billion, one hundred eleven million, three hundred thousand, twenty-one".