21194825 has 12 divisors (see below), whose sum is σ = 26539968. Its totient is φ = 16789200.

The previous prime is 21194819. The next prime is 21194851. The reversal of 21194825 is 52849112.

It is not a de Polignac number, because 21194825 - 2¹⁴ = 21178441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21194791 and 21194800.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1541 + ... + 6690.

It is an arithmetic number, because the mean of its divisors is an integer number (2211664).

Almost surely, 2^21194825 is an apocalyptic number.

21194825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21194825 is a deficient number, since it is larger than the sum of its proper divisors (5345143).

21194825 is a wasteful number, since it uses less digits than its factorization.

21194825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8344 (or 8339 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 21194825 is about 4603.7837699006. The cubic root of 21194825 is about 276.7429790619.

The spelling of 21194825 in words is "twenty-one million, one hundred ninety-four thousand, eight hundred twenty-five".