21194125 has 8 divisors (see below), whose sum is σ = 26450424. Its totient is φ = 16955200.

The previous prime is 21194123. The next prime is 21194149. The reversal of 21194125 is 52149112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2643876 + 18550249 = 1626^2 + 4307^2 .

It is not a de Polignac number, because 21194125 - 2¹ = 21194123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21194125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194123) 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, 84652 + ... + 84901.

It is an arithmetic number, because the mean of its divisors is an integer number (3306303).

Almost surely, 2^21194125 is an apocalyptic number.

21194125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21194125 is a deficient number, since it is larger than the sum of its proper divisors (5256299).

21194125 is an equidigital number, since it uses as much as digits as its factorization.

21194125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169568 (or 169558 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

The square root of 21194125 is about 4603.7077448509. The cubic root of 21194125 is about 276.7399323713.

The spelling of 21194125 in words is "twenty-one million, one hundred ninety-four thousand, one hundred twenty-five".