211421725 has 12 divisors (see below), whose sum is σ = 265111380. Its totient is φ = 167235200.

The previous prime is 211421719. The next prime is 211421747. The reversal of 211421725 is 527124112.

It can be written as a sum of positive squares in 6 ways, for example, as 18156121 + 193265604 = 4261^2 + 13902^2 .

It is not a de Polignac number, because 211421725 - 2⁷ = 211421597 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 211421725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45286 + ... + 49735.

It is an arithmetic number, because the mean of its divisors is an integer number (22092615).

Almost surely, 2^211421725 is an apocalyptic number.

211421725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211421725 is a deficient number, since it is larger than the sum of its proper divisors (53689655).

211421725 is an equidigital number, since it uses as much as digits as its factorization.

211421725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95120 (or 95115 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 211421725 is about 14540.3481732729. The cubic root of 211421725 is about 595.7305481764.

Adding to 211421725 its reverse (527124112), we get a palindrome (738545837).

The spelling of 211421725 in words is "two hundred eleven million, four hundred twenty-one thousand, seven hundred twenty-five".