21201125 has 32 divisors (see below), whose sum is σ = 30595968. Its totient is φ = 14496000.

The previous prime is 21201121. The next prime is 21201127. The reversal of 21201125 is 52110212.

It is not a de Polignac number, because 21201125 - 2² = 21201121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22922 + ... + 23828.

It is an arithmetic number, because the mean of its divisors is an integer number (956124).

Almost surely, 2^21201125 is an apocalyptic number.

21201125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21201125 is a deficient number, since it is larger than the sum of its proper divisors (9394843).

21201125 is a wasteful number, since it uses less digits than its factorization.

21201125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21201125 is about 4604.4679388611. The cubic root of 21201125 is about 276.7703962585.

Adding to 21201125 its reverse (52110212), we get a palindrome (73311337).

The spelling of 21201125 in words is "twenty-one million, two hundred one thousand, one hundred twenty-five".