21232420463 has 4 divisors (see below), whose sum is σ = 21232712088. Its totient is φ = 21232128840.

The previous prime is 21232420421. The next prime is 21232420477. The reversal of 21232420463 is 36402423212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21232420463 - 2⁸ = 21232420207 is a prime.

It is a super-2 number, since 2×21232420463² (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 (21232420163) 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, 64868 + ... + 216038.

It is an arithmetic number, because the mean of its divisors is an integer number (5308178022).

Almost surely, 2^21232420463 is an apocalyptic number.

21232420463 is a deficient number, since it is larger than the sum of its proper divisors (291625).

21232420463 is a wasteful number, since it uses less digits than its factorization.

21232420463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291624.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21232420463 its reverse (36402423212), we get a palindrome (57634843675).

The spelling of 21232420463 in words is "twenty-one billion, two hundred thirty-two million, four hundred twenty thousand, four hundred sixty-three".