21117022 has 8 divisors (see below), whose sum is σ = 31761576. Its totient is φ = 10529832.

The previous prime is 21117007. The next prime is 21117029. The reversal of 21117022 is 22071112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21116987 and 21117005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21117029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13408 + ... + 14899.

It is an arithmetic number, because the mean of its divisors is an integer number (3970197).

Almost surely, 2^21117022 is an apocalyptic number.

21117022 is a deficient number, since it is larger than the sum of its proper divisors (10644554).

21117022 is a wasteful number, since it uses less digits than its factorization.

21117022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28682.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21117022 is about 4595.3261037711. The cubic root of 21117022 is about 276.4039366451.

Adding to 21117022 its reverse (22071112), we get a palindrome (43188134).

The spelling of 21117022 in words is "twenty-one million, one hundred seventeen thousand, twenty-two".