212284901 has 4 divisors (see below), whose sum is σ = 219605100. Its totient is φ = 204964704.

The previous prime is 212284883. The next prime is 212284903. The reversal of 212284901 is 109482212.

It is a Cunningham number, because it is equal to 14570²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111302500 + 100982401 = 10550^2 + 10049^2 .

It is a cyclic number.

It is not a de Polignac number, because 212284901 - 2⁶ = 212284837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 7320169 = 212284901 / (2 + 1 + 2 + 2 + 8 + 4 + 9 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212284903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660056 + ... + 3660113.

It is an arithmetic number, because the mean of its divisors is an integer number (54901275).

Almost surely, 2^212284901 is an apocalyptic number.

It is an amenable number.

212284901 is a deficient number, since it is larger than the sum of its proper divisors (7320199).

212284901 is an equidigital number, since it uses as much as digits as its factorization.

212284901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7320198.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 212284901 is about 14570.0000343171. Note that the first 4 decimals coincide. The cubic root of 212284901 is about 596.5401812901.

The spelling of 212284901 in words is "two hundred twelve million, two hundred eighty-four thousand, nine hundred one".