21322013 has 8 divisors (see below), whose sum is σ = 21788832. Its totient is φ = 20859696.

The previous prime is 21322003. The next prime is 21322019. The reversal of 21322013 is 31022312.

It is a happy number.

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-21322013 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 (21322019) 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, 9506 + ... + 11532.

It is an arithmetic number, because the mean of its divisors is an integer number (2723604).

Almost surely, 2^21322013 is an apocalyptic number.

It is an amenable number.

21322013 is a deficient number, since it is larger than the sum of its proper divisors (466819).

21322013 is a wasteful number, since it uses less digits than its factorization.

21322013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21322013 is about 4617.5765288731. The cubic root of 21322013 is about 277.2954443059.

Adding to 21322013 its reverse (31022312), we get a palindrome (52344325).

The spelling of 21322013 in words is "twenty-one million, three hundred twenty-two thousand, thirteen".