21003013231 has 8 divisors (see below), whose sum is σ = 22119601280. Its totient is φ = 19887541848.

The previous prime is 21003013223. The next prime is 21003013237. The reversal of 21003013231 is 13231030012.

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 21003013231 - 2³ = 21003013223 is a prime.

It is a super-2 number, since 2×21003013231² (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 (21003013237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240411 + ... + 315916.

It is an arithmetic number, because the mean of its divisors is an integer number (2764950160).

Almost surely, 2^21003013231 is an apocalyptic number.

21003013231 is a deficient number, since it is larger than the sum of its proper divisors (1116588049).

21003013231 is a wasteful number, since it uses less digits than its factorization.

21003013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558333.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21003013231 its reverse (13231030012), we get a palindrome (34234043243).

The spelling of 21003013231 in words is "twenty-one billion, three million, thirteen thousand, two hundred thirty-one".