21134025 has 36 divisors (see below), whose sum is σ = 41299440. Its totient is φ = 10245600.

The previous prime is 21134021. The next prime is 21134063. The reversal of 21134025 is 52043112.

It is not a de Polignac number, because 21134025 - 2² = 21134021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21133989 and 21134007.

It is not an unprimeable number, because it can be changed into a prime (21134021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1795 + ... + 6744.

Almost surely, 2^21134025 is an apocalyptic number.

21134025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21134025 is a deficient number, since it is larger than the sum of its proper divisors (20165415).

21134025 is a wasteful number, since it uses less digits than its factorization.

21134025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8566 (or 8558 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21134025 is about 4597.1757634443. The cubic root of 21134025 is about 276.4781017007.

Adding to 21134025 its reverse (52043112), we get a palindrome (73177137).

The spelling of 21134025 in words is "twenty-one million, one hundred thirty-four thousand, twenty-five".