21998102 has 24 divisors (see below), whose sum is σ = 40067184. Its totient is φ = 8871552.

The previous prime is 21998033. The next prime is 21998107. The reversal of 21998102 is 20189912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21998107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1328 + ... + 6764.

It is an arithmetic number, because the mean of its divisors is an integer number (1669466).

Almost surely, 2^21998102 is an apocalyptic number.

21998102 is a deficient number, since it is larger than the sum of its proper divisors (18069082).

21998102 is a wasteful number, since it uses less digits than its factorization.

21998102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480 (or 5463 counting only the distinct ones).

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

The square root of 21998102 is about 4690.2134279796. The cubic root of 21998102 is about 280.1958748480.

It can be divided in two parts, 2199 and 8102, that added together give a palindrome (10301).

The spelling of 21998102 in words is "twenty-one million, nine hundred ninety-eight thousand, one hundred two".