21210022 has 8 divisors (see below), whose sum is σ = 31838400. Its totient is φ = 10597224.

The previous prime is 21210011. The next prime is 21210037. The reversal of 21210022 is 22001212.

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 = 21209990 and 21210008.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504 + ... + 6532.

It is an arithmetic number, because the mean of its divisors is an integer number (3979800).

Almost surely, 2^21210022 is an apocalyptic number.

21210022 is a deficient number, since it is larger than the sum of its proper divisors (10628378).

21210022 is a wasteful number, since it uses less digits than its factorization.

21210022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21210022 is about 4605.4339643512. The cubic root of 21210022 is about 276.8091061830.

Adding to 21210022 its reverse (22001212), we get a palindrome (43211234).

The spelling of 21210022 in words is "twenty-one million, two hundred ten thousand, twenty-two".