12145213235021 has 4 divisors (see below), whose sum is σ = 12161919168672. Its totient is φ = 12128507301372.

The previous prime is 12145213234829. The next prime is 12145213235059. The reversal of 12145213235021 is 12053231254121.

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 12145213235021 - 2¹⁰ = 12145213233997 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 (12145213235621) 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, 8352965735 + ... + 8352967188.

It is an arithmetic number, because the mean of its divisors is an integer number (3040479792168).

Almost surely, 2^{12145213235021} is an apocalyptic number.

It is an amenable number.

12145213235021 is a deficient number, since it is larger than the sum of its proper divisors (16705933651).

12145213235021 is an equidigital number, since it uses as much as digits as its factorization.

12145213235021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16705933650.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 12145213235021 its reverse (12053231254121), we get a palindrome (24198444489142).

The spelling of 12145213235021 in words is "twelve trillion, one hundred forty-five billion, two hundred thirteen million, two hundred thirty-five thousand, twenty-one".