21001031200213 has 8 divisors (see below), whose sum is σ = 21083153781528. Its totient is φ = 20918911770624.

The previous prime is 21001031200157. The next prime is 21001031200277. The reversal of 21001031200213 is 31200213010012.

It can be written as a sum of positive squares in 4 ways, for example, as 11852444936644 + 9148586263569 = 3442738^2 + 3024663^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001031200213 is a prime.

It is a super-2 number, since 2×21001031200213² (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 (21001031200813) 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, 13038145 + ... + 14560057.

It is an arithmetic number, because the mean of its divisors is an integer number (2635394222691).

Almost surely, 2^{21001031200213} is an apocalyptic number.

It is an amenable number.

21001031200213 is a deficient number, since it is larger than the sum of its proper divisors (82122581315).

21001031200213 is a wasteful number, since it uses less digits than its factorization.

21001031200213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575863.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21001031200213 its reverse (31200213010012), we get a palindrome (52201244210225).

The spelling of 21001031200213 in words is "twenty-one trillion, one billion, thirty-one million, two hundred thousand, two hundred thirteen".