21403333231 has 12 divisors (see below), whose sum is σ = 24905710872. Its totient is φ = 18339852048.

The previous prime is 21403333229. The next prime is 21403333247. The reversal of 21403333231 is 13233330412.

It is not a de Polignac number, because 21403333231 - 2¹ = 21403333229 is a prime.

It is a super-2 number, since 2×21403333231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21403333196 and 21403333205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403333201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88761 + ... + 225133.

It is an arithmetic number, because the mean of its divisors is an integer number (2075475906).

Almost surely, 2^21403333231 is an apocalyptic number.

21403333231 is a deficient number, since it is larger than the sum of its proper divisors (3502377641).

21403333231 is a wasteful number, since it uses less digits than its factorization.

21403333231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139590 (or 139583 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 21403333231 its reverse (13233330412), we get a palindrome (34636663643).

The spelling of 21403333231 in words is "twenty-one billion, four hundred three million, three hundred thirty-three thousand, two hundred thirty-one".