23420213531 has 8 divisors (see below), whose sum is σ = 27514656624. Its totient is φ = 19653325920.

The previous prime is 23420213483. The next prime is 23420213543. The reversal of 23420213531 is 13531202432.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23420213531 - 2¹⁴ = 23420197147 is a prime.

It is a super-2 number, since 2×23420213531² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23420213531.

It is not an unprimeable number, because it can be changed into a prime (23420218531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81888716 + ... + 81889001.

It is an arithmetic number, because the mean of its divisors is an integer number (3439332078).

Almost surely, 2^23420213531 is an apocalyptic number.

23420213531 is a deficient number, since it is larger than the sum of its proper divisors (4094443093).

23420213531 is a wasteful number, since it uses less digits than its factorization.

23420213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163777741.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 23420213531 its reverse (13531202432), we get a palindrome (36951415963).

The spelling of 23420213531 in words is "twenty-three billion, four hundred twenty million, two hundred thirteen thousand, five hundred thirty-one".