21317022 has 24 divisors (see below), whose sum is σ = 46822464. Its totient is φ = 7007904.

The previous prime is 21317017. The next prime is 21317027. The reversal of 21317022 is 22071312.

It is an interprime number because it is at equal distance from previous prime (21317017) and next prime (21317027).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21316986 and 21317004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21317027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6798 + ... + 9425.

It is an arithmetic number, because the mean of its divisors is an integer number (1950936).

Almost surely, 2^21317022 is an apocalyptic number.

21317022 is an abundant number, since it is smaller than the sum of its proper divisors (25505442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21317022 is a wasteful number, since it uses less digits than its factorization.

21317022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16304 (or 16301 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21317022 is about 4617.0360622373. The cubic root of 21317022 is about 277.2738064245.

Adding to 21317022 its reverse (22071312), we get a palindrome (43388334).

The spelling of 21317022 in words is "twenty-one million, three hundred seventeen thousand, twenty-two".