1231104433021 has 4 divisors (see below), whose sum is σ = 1295899403200. Its totient is φ = 1166309462844.

The previous prime is 1231104432989. The next prime is 1231104433033. The reversal of 1231104433021 is 1203344011321.

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 1231104433021 - 2⁵ = 1231104432989 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 (1231104430021) 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, 32397485061 + ... + 32397485098.

It is an arithmetic number, because the mean of its divisors is an integer number (323974850800).

Almost surely, 2^{1231104433021} is an apocalyptic number.

It is an amenable number.

1231104433021 is a deficient number, since it is larger than the sum of its proper divisors (64794970179).

1231104433021 is an equidigital number, since it uses as much as digits as its factorization.

1231104433021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64794970178.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 1231104433021 its reverse (1203344011321), we get a palindrome (2434448444342).

The spelling of 1231104433021 in words is "one trillion, two hundred thirty-one billion, one hundred four million, four hundred thirty-three thousand, twenty-one".