21310021213 has 8 divisors (see below), whose sum is σ = 22954265600. Its totient is φ = 19666492848.

The previous prime is 21310021199. The next prime is 21310021223. The reversal of 21310021213 is 31212001312.

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-21310021213 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 (21310021223) 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, 116373 + ... + 236986.

It is an arithmetic number, because the mean of its divisors is an integer number (2869283200).

Almost surely, 2^21310021213 is an apocalyptic number.

It is an amenable number.

21310021213 is a deficient number, since it is larger than the sum of its proper divisors (1644244387).

21310021213 is a wasteful number, since it uses less digits than its factorization.

21310021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358011.

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

Adding to 21310021213 its reverse (31212001312), we get a palindrome (52522022525).

The spelling of 21310021213 in words is "twenty-one billion, three hundred ten million, twenty-one thousand, two hundred thirteen".