1231103300021 has 4 divisors (see below), whose sum is σ = 1406975200032. Its totient is φ = 1055231400012.

The previous prime is 1231103299981. The next prime is 1231103300027. The reversal of 1231103300021 is 1200033011321.

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 not a de Polignac number, because 1231103300021 - 2¹⁸ = 1231103037877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231103300027) 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, 87935949995 + ... + 87935950008.

It is an arithmetic number, because the mean of its divisors is an integer number (351743800008).

Almost surely, 2^{1231103300021} is an apocalyptic number.

It is an amenable number.

1231103300021 is a deficient number, since it is larger than the sum of its proper divisors (175871900011).

1231103300021 is an equidigital number, since it uses as much as digits as its factorization.

1231103300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175871900010.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1231103300021 its reverse (1200033011321), we get a palindrome (2431136311342).

The spelling of 1231103300021 in words is "one trillion, two hundred thirty-one billion, one hundred three million, three hundred thousand, twenty-one".