21340125 has 32 divisors (see below), whose sum is σ = 39461760. Its totient is φ = 11379600.

The previous prime is 21340093. The next prime is 21340141. The reversal of 21340125 is 52104312.

It is not a de Polignac number, because 21340125 - 2⁵ = 21340093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21340098 and 21340107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214 + ... + 6536.

It is an arithmetic number, because the mean of its divisors is an integer number (1233180).

Almost surely, 2^21340125 is an apocalyptic number.

21340125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21340125 is a deficient number, since it is larger than the sum of its proper divisors (18121635).

21340125 is an equidigital number, since it uses as much as digits as its factorization.

21340125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6347 (or 6331 counting only the distinct ones).

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

The square root of 21340125 is about 4619.5373144937. The cubic root of 21340125 is about 277.3739383591.

Adding to 21340125 its reverse (52104312), we get a palindrome (73444437).

The spelling of 21340125 in words is "twenty-one million, three hundred forty thousand, one hundred twenty-five".