21211222013 has 8 divisors (see below), whose sum is σ = 21333916800. Its totient is φ = 21088574208.

The previous prime is 21211221991. The next prime is 21211222051. The reversal of 21211222013 is 31022211212.

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

It is a cyclic number.

It is not a de Polignac number, because 21211222013 - 2³² = 16916254717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21211221982 and 21211222000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222063) 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, 1332620 + ... + 1348442.

It is an arithmetic number, because the mean of its divisors is an integer number (2666739600).

Almost surely, 2^21211222013 is an apocalyptic number.

It is an amenable number.

21211222013 is a deficient number, since it is larger than the sum of its proper divisors (122694787).

21211222013 is a wasteful number, since it uses less digits than its factorization.

21211222013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23491.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21211222013 its reverse (31022211212), we get a palindrome (52233433225).

The spelling of 21211222013 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, thirteen".