21002140004231 has 8 divisors (see below), whose sum is σ = 21023184977280. Its totient is φ = 20981095885048.

The previous prime is 21002140004227. The next prime is 21002140004239. The reversal of 21002140004231 is 13240004120012.

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 21002140004231 - 2² = 21002140004227 is a prime.

It is a super-2 number, since 2×21002140004231² (a number of 27 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 (21002140004239) 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, 56539550 + ... + 56909796.

It is an arithmetic number, because the mean of its divisors is an integer number (2627898122160).

Almost surely, 2^{21002140004231} is an apocalyptic number.

21002140004231 is a deficient number, since it is larger than the sum of its proper divisors (21044973049).

21002140004231 is a wasteful number, since it uses less digits than its factorization.

21002140004231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426933.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21002140004231 its reverse (13240004120012), we get a palindrome (34242144124243).

The spelling of 21002140004231 in words is "twenty-one trillion, two billion, one hundred forty million, four thousand, two hundred thirty-one".