21214025 has 24 divisors (see below), whose sum is σ = 30248064. Its totient is φ = 14457600.

The previous prime is 21214021. The next prime is 21214049. The reversal of 21214025 is 52041212.

It is not a de Polignac number, because 21214025 - 2² = 21214021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21213994 and 21214012.

It is not an unprimeable number, because it can be changed into a prime (21214021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41924 + ... + 42426.

It is an arithmetic number, because the mean of its divisors is an integer number (1260336).

Almost surely, 2^21214025 is an apocalyptic number.

21214025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21214025 is a deficient number, since it is larger than the sum of its proper divisors (9034039).

21214025 is a wasteful number, since it uses less digits than its factorization.

21214025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21214025 is about 4605.8685391574. The cubic root of 21214025 is about 276.8265192900.

Adding to 21214025 its reverse (52041212), we get a palindrome (73255237).

The spelling of 21214025 in words is "twenty-one million, two hundred fourteen thousand, twenty-five".