21770325 has 18 divisors (see below), whose sum is σ = 38993474. Its totient is φ = 11610720.

The previous prime is 21770323. The next prime is 21770363. The reversal of 21770325 is 52307712.

It can be written as a sum of positive squares in 3 ways, for example, as 7436529 + 14333796 = 2727^2 + 3786^2 .

It is not a de Polignac number, because 21770325 - 2¹ = 21770323 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48154 + ... + 48603.

Almost surely, 2^21770325 is an apocalyptic number.

21770325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21770325 is a deficient number, since it is larger than the sum of its proper divisors (17223149).

21770325 is a wasteful number, since it uses less digits than its factorization.

21770325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96773 (or 96765 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21770325 is about 4665.8680864336. The cubic root of 21770325 is about 279.2254315537.

The spelling of 21770325 in words is "twenty-one million, seven hundred seventy thousand, three hundred twenty-five".