21001002220013 has 4 divisors (see below), whose sum is σ = 21011507976000. Its totient is φ = 20990496464028.

The previous prime is 21001002219997. The next prime is 21001002220021. The reversal of 21001002220013 is 31002220010012.

It is a happy number.

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 21001002220013 - 2⁴ = 21001002219997 is a prime.

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 21001002220013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001002223013) 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, 5252874995 + ... + 5252878992.

It is an arithmetic number, because the mean of its divisors is an integer number (5252876994000).

Almost surely, 2^{21001002220013} is an apocalyptic number.

It is an amenable number.

21001002220013 is a deficient number, since it is larger than the sum of its proper divisors (10505755987).

21001002220013 is a wasteful number, since it uses less digits than its factorization.

21001002220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505755986.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21001002220013 its reverse (31002220010012), we get a palindrome (52003222230025).

The spelling of 21001002220013 in words is "twenty-one trillion, one billion, two million, two hundred twenty thousand, thirteen".