21423041213 has 4 divisors (see below), whose sum is σ = 24483475680. Its totient is φ = 18362606748.

The previous prime is 21423041183. The next prime is 21423041279. The reversal of 21423041213 is 31214032412.

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 21423041213 - 2⁸ = 21423040957 is a prime.

It is a super-2 number, since 2×21423041213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423041293) 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, 1530217223 + ... + 1530217236.

It is an arithmetic number, because the mean of its divisors is an integer number (6120868920).

Almost surely, 2^21423041213 is an apocalyptic number.

It is an amenable number.

21423041213 is a deficient number, since it is larger than the sum of its proper divisors (3060434467).

21423041213 is an equidigital number, since it uses as much as digits as its factorization.

21423041213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060434466.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21423041213 its reverse (31214032412), we get a palindrome (52637073625).

The spelling of 21423041213 in words is "twenty-one billion, four hundred twenty-three million, forty-one thousand, two hundred thirteen".