21962225 has 6 divisors (see below), whose sum is σ = 27233190. Its totient is φ = 17569760.

The previous prime is 21962209. The next prime is 21962261. The reversal of 21962225 is 52226912.

It can be written as a sum of positive squares in 3 ways, for example, as 274576 + 21687649 = 524^2 + 4657^2 .

It is not a de Polignac number, because 21962225 - 2⁴ = 21962209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439220 + ... + 439269.

It is an arithmetic number, because the mean of its divisors is an integer number (4538865).

Almost surely, 2^21962225 is an apocalyptic number.

21962225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21962225 is a deficient number, since it is larger than the sum of its proper divisors (5270965).

21962225 is an equidigital number, since it uses as much as digits as its factorization.

21962225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878499 (or 878494 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 21962225 is about 4686.3872012458. The cubic root of 21962225 is about 280.0434668914.

The spelling of 21962225 in words is "twenty-one million, nine hundred sixty-two thousand, two hundred twenty-five".