21190153 has 12 divisors (see below), whose sum is σ = 22715028. Its totient is φ = 19754240.

The previous prime is 21190151. The next prime is 21190171. The reversal of 21190153 is 35109112.

It can be written as a sum of positive squares in 2 ways, for example, as 10220809 + 10969344 = 3197^2 + 3312^2 .

It is not a de Polignac number, because 21190153 - 2¹ = 21190151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21190151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21201 + ... + 22177.

It is an arithmetic number, because the mean of its divisors is an integer number (1892919).

Almost surely, 2^21190153 is an apocalyptic number.

21190153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21190153 is a deficient number, since it is larger than the sum of its proper divisors (1524875).

21190153 is an equidigital number, since it uses as much as digits as its factorization.

21190153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1041 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 21190153 is about 4603.2763332218. The cubic root of 21190153 is about 276.7226433084.

Adding to 21190153 its reverse (35109112), we get a palindrome (56299265).

The spelling of 21190153 in words is "twenty-one million, one hundred ninety thousand, one hundred fifty-three".