21425193 has 12 divisors (see below), whose sum is σ = 31410288. Its totient is φ = 14069880.

The previous prime is 21425189. The next prime is 21425203. The reversal of 21425193 is 39152412.

21425193 is a `hidden beast` number, since 2 + 142 + 519 + 3 = 666.

It is not a de Polignac number, because 21425193 - 2² = 21425189 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21425153) 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, 17163 + ... + 18368.

It is an arithmetic number, because the mean of its divisors is an integer number (2617524).

Almost surely, 2^21425193 is an apocalyptic number.

It is an amenable number.

21425193 is a deficient number, since it is larger than the sum of its proper divisors (9985095).

21425193 is a wasteful number, since it uses less digits than its factorization.

21425193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35604 (or 35601 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21425193 is about 4628.7355724863. The cubic root of 21425193 is about 277.7420143409.

The spelling of 21425193 in words is "twenty-one million, four hundred twenty-five thousand, one hundred ninety-three".