21212002 has 24 divisors (see below), whose sum is σ = 37198656. Its totient is φ = 9045288.

The previous prime is 21211997. The next prime is 21212017. The reversal of 21212002 is 20021212.

It is a self number, because there is not a number n which added to its sum of digits gives 21212002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25363 + ... + 26185.

It is an arithmetic number, because the mean of its divisors is an integer number (1549944).

Almost surely, 2^21212002 is an apocalyptic number.

21212002 is a deficient number, since it is larger than the sum of its proper divisors (15986654).

21212002 is a wasteful number, since it uses less digits than its factorization.

21212002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102 (or 1095 counting only the distinct ones).

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

The square root of 21212002 is about 4605.6489227904. The cubic root of 21212002 is about 276.8177194850.

Adding to 21212002 its reverse (20021212), we get a palindrome (41233214).

The spelling of 21212002 in words is "twenty-one million, two hundred twelve thousand, two".