1231230300021 has 8 divisors (see below), whose sum is σ = 1824044888960. Its totient is φ = 820820199996.

The previous prime is 1231230300017. The next prime is 1231230300023. The reversal of 1231230300021 is 1200030321321.

1231230300021 is a `hidden beast` number, since 1 + 2 + 312 + 30 + 300 + 0 + 21 = 666.

It is not a de Polignac number, because 1231230300021 - 2² = 1231230300017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231230299967 and 1231230300003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231230300023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22800561085 + ... + 22800561138.

It is an arithmetic number, because the mean of its divisors is an integer number (228005611120).

Almost surely, 2^{1231230300021} is an apocalyptic number.

It is an amenable number.

1231230300021 is a deficient number, since it is larger than the sum of its proper divisors (592814588939).

1231230300021 is an equidigital number, since it uses as much as digits as its factorization.

1231230300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45601122232 (or 45601122226 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 1231230300021 its reverse (1200030321321), we get a palindrome (2431260621342).

The spelling of 1231230300021 in words is "one trillion, two hundred thirty-one billion, two hundred thirty million, three hundred thousand, twenty-one".