21698322 has 16 divisors (see below), whose sum is σ = 44893440. Its totient is φ = 6983312.

The previous prime is 21698321. The next prime is 21698387. The reversal of 21698322 is 22389612.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21698321) 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 7 ways as a sum of consecutive naturals, for example, 62178 + ... + 62525.

It is an arithmetic number, because the mean of its divisors is an integer number (2805840).

Almost surely, 2^21698322 is an apocalyptic number.

21698322 is an abundant number, since it is smaller than the sum of its proper divisors (23195118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21698322 is a wasteful number, since it uses less digits than its factorization.

21698322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124737.

The product of its digits is 10368, while the sum is 33.

The square root of 21698322 is about 4658.1457684362. The cubic root of 21698322 is about 278.9172555591.

The spelling of 21698322 in words is "twenty-one million, six hundred ninety-eight thousand, three hundred twenty-two".