21301125 has 32 divisors (see below), whose sum is σ = 36296832. Its totient is φ = 11088000.

The previous prime is 21301097. The next prime is 21301157. The reversal of 21301125 is 52110312.

It is not a de Polignac number, because 21301125 - 2⁷ = 21300997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 15465 + ... + 16785.

It is an arithmetic number, because the mean of its divisors is an integer number (1134276).

Almost surely, 2^21301125 is an apocalyptic number.

21301125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21301125 is a deficient number, since it is larger than the sum of its proper divisors (14995707).

21301125 is a wasteful number, since it uses less digits than its factorization.

21301125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382 (or 1372 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21301125 is about 4615.3141821549. The cubic root of 21301125 is about 277.2048643704.

Adding to 21301125 its reverse (52110312), we get a palindrome (73411437).

The spelling of 21301125 in words is "twenty-one million, three hundred one thousand, one hundred twenty-five".