21420230431 has 8 divisors (see below), whose sum is σ = 22584167280. Its totient is φ = 20259949248.

The previous prime is 21420230417. The next prime is 21420230437. The reversal of 21420230431 is 13403202412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21420230431 is a prime.

It is a super-2 number, since 2×21420230431² (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 (21420230437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901876 + ... + 925321.

It is an arithmetic number, because the mean of its divisors is an integer number (2823020910).

Almost surely, 2^21420230431 is an apocalyptic number.

21420230431 is a deficient number, since it is larger than the sum of its proper divisors (1163936849).

21420230431 is a wasteful number, since it uses less digits than its factorization.

21420230431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827833.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21420230431 its reverse (13403202412), we get a palindrome (34823432843).

The spelling of 21420230431 in words is "twenty-one billion, four hundred twenty million, two hundred thirty thousand, four hundred thirty-one".