21022313 has 8 divisors (see below), whose sum is σ = 23166528. Its totient is φ = 18953424.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022313 is 31322012.

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 not a de Polignac number, because 21022313 - 2⁶ = 21022249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21022363) 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, 18245 + ... + 19362.

It is an arithmetic number, because the mean of its divisors is an integer number (2895816).

Almost surely, 2^21022313 is an apocalyptic number.

It is an amenable number.

21022313 is a deficient number, since it is larger than the sum of its proper divisors (2144215).

21022313 is a wasteful number, since it uses less digits than its factorization.

21022313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37663.

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

The square root of 21022313 is about 4585.0095965003. The cubic root of 21022313 is about 275.9900971382.

Adding to 21022313 its reverse (31322012), we get a palindrome (52344325).

The spelling of 21022313 in words is "twenty-one million, twenty-two thousand, three hundred thirteen".