21232310403 has 16 divisors (see below), whose sum is σ = 28485746336. Its totient is φ = 14067025920.

The previous prime is 21232310369. The next prime is 21232310419. The reversal of 21232310403 is 30401323212.

It is not a de Polignac number, because 21232310403 - 2¹⁰ = 21232309379 is a prime.

It is a super-2 number, since 2×21232310403² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21232310403.

It is not an unprimeable number, because it can be changed into a prime (21232310453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558873 + ... + 595653.

It is an arithmetic number, because the mean of its divisors is an integer number (1780359146).

Almost surely, 2^21232310403 is an apocalyptic number.

21232310403 is a deficient number, since it is larger than the sum of its proper divisors (7253435933).

21232310403 is a wasteful number, since it uses less digits than its factorization.

21232310403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37974.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21232310403 its reverse (30401323212), we get a palindrome (51633633615).

The spelling of 21232310403 in words is "twenty-one billion, two hundred thirty-two million, three hundred ten thousand, four hundred three".