21000002000213 has 4 divisors (see below), whose sum is σ = 21006696297900. Its totient is φ = 20993307702528.

The previous prime is 21000002000179. The next prime is 21000002000269. The reversal of 21000002000213 is 31200020000012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15551965185604 + 5448036814609 = 3943598^2 + 2334103^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000002000213 - 2¹⁶ = 21000001934677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000002000194 and 21000002000203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000002000113) 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, 3347144138 + ... + 3347150411.

It is an arithmetic number, because the mean of its divisors is an integer number (5251674074475).

Almost surely, 2^{21000002000213} is an apocalyptic number.

It is an amenable number.

21000002000213 is a deficient number, since it is larger than the sum of its proper divisors (6694297687).

21000002000213 is an equidigital number, since it uses as much as digits as its factorization.

21000002000213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6694297686.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21000002000213 its reverse (31200020000012), we get a palindrome (52200022000225).

The spelling of 21000002000213 in words is "twenty-one trillion, two million, two hundred thirteen", and thus it is an aban number.