21310022 has 4 divisors (see below), whose sum is σ = 31965036. Its totient is φ = 10655010.

The previous prime is 21310021. The next prime is 21310043. The reversal of 21310022 is 22001312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21309985 and 21310012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5327504 + ... + 5327507.

It is an arithmetic number, because the mean of its divisors is an integer number (7991259).

Almost surely, 2^21310022 is an apocalyptic number.

21310022 is a deficient number, since it is larger than the sum of its proper divisors (10655014).

21310022 is a wasteful number, since it uses less digits than its factorization.

21310022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655013.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21310022 is about 4616.2779379063. The cubic root of 21310022 is about 277.2434530738.

Adding to 21310022 its reverse (22001312), we get a palindrome (43311334).

The spelling of 21310022 in words is "twenty-one million, three hundred ten thousand, twenty-two".