21190169 has 16 divisors (see below), whose sum is σ = 28452480. Its totient is φ = 15240960.

The previous prime is 21190151. The next prime is 21190171. The reversal of 21190169 is 96109112.

It is not a de Polignac number, because 21190169 - 2⁸ = 21189913 is a prime.

It is a super-2 number, since 2×21190169² = 898046524497122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21190139) 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 15 ways as a sum of consecutive naturals, for example, 9584 + ... + 11585.

It is an arithmetic number, because the mean of its divisors is an integer number (1778280).

Almost surely, 2^21190169 is an apocalyptic number.

It is an amenable number.

21190169 is a deficient number, since it is larger than the sum of its proper divisors (7262311).

21190169 is a wasteful number, since it uses less digits than its factorization.

21190169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21200.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 21190169 is about 4603.2780711141. The cubic root of 21190169 is about 276.7227129564.

The spelling of 21190169 in words is "twenty-one million, one hundred ninety thousand, one hundred sixty-nine".