21109522 has 16 divisors (see below), whose sum is σ = 36374400. Its totient is φ = 9000288.

The previous prime is 21109493. The next prime is 21109549. The reversal of 21109522 is 22590112.

It is a super-2 number, since 2×21109522² = 891223838136968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21109493 and 21109502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1003 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (2273400).

Almost surely, 2^21109522 is an apocalyptic number.

21109522 is a deficient number, since it is larger than the sum of its proper divisors (15264878).

21109522 is a wasteful number, since it uses less digits than its factorization.

21109522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7785.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21109522 is about 4594.5099847535. The cubic root of 21109522 is about 276.3712098873.

Adding to 21109522 its reverse (22590112), we get a palindrome (43699634).

The spelling of 21109522 in words is "twenty-one million, one hundred nine thousand, five hundred twenty-two".