21761125 has 16 divisors (see below), whose sum is σ = 27428544. Its totient is φ = 17235600.

The previous prime is 21761093. The next prime is 21761153. The reversal of 21761125 is 52116712.

It is not a de Polignac number, because 21761125 - 2⁵ = 21761093 is a prime.

It is a super-2 number, since 2×21761125² = 947093122531250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21761125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12562 + ... + 14188.

It is an arithmetic number, because the mean of its divisors is an integer number (1714284).

Almost surely, 2^21761125 is an apocalyptic number.

21761125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21761125 is a deficient number, since it is larger than the sum of its proper divisors (5667419).

21761125 is a wasteful number, since it uses less digits than its factorization.

21761125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1739 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 21761125 is about 4664.8820992604. The cubic root of 21761125 is about 279.1860930517.

Adding to 21761125 its reverse (52116712), we get a palindrome (73877837).

The spelling of 21761125 in words is "twenty-one million, seven hundred sixty-one thousand, one hundred twenty-five".