21214125 has 48 divisors (see below), whose sum is σ = 38815920. Its totient is φ = 11145600.

The previous prime is 21214117. The next prime is 21214133. The reversal of 21214125 is 52141212.

It is an interprime number because it is at equal distance from previous prime (21214117) and next prime (21214133).

It can be written as a sum of positive squares in 8 ways, for example, as 1447209 + 19766916 = 1203^2 + 4446^2 .

It is not a de Polignac number, because 21214125 - 2³ = 21214117 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21214098 and 21214107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122539 + ... + 122711.

It is an arithmetic number, because the mean of its divisors is an integer number (808665).

Almost surely, 2^21214125 is an apocalyptic number.

21214125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21214125 is a deficient number, since it is larger than the sum of its proper divisors (17601795).

21214125 is a wasteful number, since it uses less digits than its factorization.

21214125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 290 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21214125 is about 4605.8793948604. The cubic root of 21214125 is about 276.8269542634.

Adding to 21214125 its reverse (52141212), we get a palindrome (73355337).

The spelling of 21214125 in words is "twenty-one million, two hundred fourteen thousand, one hundred twenty-five".