21098222 has 16 divisors (see below), whose sum is σ = 33145632. Its totient is φ = 10053120.

The previous prime is 21098221. The next prime is 21098257. The reversal of 21098222 is 22289012.

It is a super-2 number, since 2×21098222² = 890269943122568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21098191 and 21098200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21098221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14822 + ... + 16182.

It is an arithmetic number, because the mean of its divisors is an integer number (2071602).

Almost surely, 2^21098222 is an apocalyptic number.

21098222 is a deficient number, since it is larger than the sum of its proper divisors (12047410).

21098222 is a wasteful number, since it uses less digits than its factorization.

21098222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21098222 is about 4593.2800916121. The cubic root of 21098222 is about 276.3218869310.

The spelling of 21098222 in words is "twenty-one million, ninety-eight thousand, two hundred twenty-two".