21989102 has 8 divisors (see below), whose sum is σ = 33150000. Its totient is φ = 10939104.

The previous prime is 21989101. The next prime is 21989111. The reversal of 21989102 is 20198912.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21989101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27227 + ... + 28022.

It is an arithmetic number, because the mean of its divisors is an integer number (4143750).

Almost surely, 2^21989102 is an apocalyptic number.

21989102 is a deficient number, since it is larger than the sum of its proper divisors (11160898).

21989102 is a wasteful number, since it uses less digits than its factorization.

21989102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55450.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 21989102 is about 4689.2538852146. The cubic root of 21989102 is about 280.1576578106.

It can be divided in two parts, 2198910 and 2, that added together give a palindrome (2198912).

The spelling of 21989102 in words is "twenty-one million, nine hundred eighty-nine thousand, one hundred two".