21001233210013 has 4 divisors (see below), whose sum is σ = 24001409382880. Its totient is φ = 18001057037148.

The previous prime is 21001233210011. The next prime is 21001233210019. The reversal of 21001233210013 is 31001233210012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21001233210013 - 2¹ = 21001233210011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001233210011) 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, 1500088086423 + ... + 1500088086436.

It is an arithmetic number, because the mean of its divisors is an integer number (6000352345720).

Almost surely, 2^{21001233210013} is an apocalyptic number.

It is an amenable number.

21001233210013 is a deficient number, since it is larger than the sum of its proper divisors (3000176172867).

21001233210013 is an equidigital number, since it uses as much as digits as its factorization.

21001233210013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000176172866.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21001233210013 its reverse (31001233210012), we get a palindrome (52002466420025).

Subtracting 21001233210013 from its reverse (31001233210012), we obtain a palindrome (9999999999999).

The spelling of 21001233210013 in words is "twenty-one trillion, one billion, two hundred thirty-three million, two hundred ten thousand, thirteen".