212056261 has 4 divisors (see below), whose sum is σ = 212387724. Its totient is φ = 211724800.

The previous prime is 212056253. The next prime is 212056277. The reversal of 212056261 is 162650212.

212056261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 205033761 + 7022500 = 14319^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 212056261 - 2³ = 212056253 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 (212056231) 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, 164770 + ... + 166051.

It is an arithmetic number, because the mean of its divisors is an integer number (53096931).

Almost surely, 2^212056261 is an apocalyptic number.

It is an amenable number.

212056261 is a deficient number, since it is larger than the sum of its proper divisors (331463).

212056261 is an equidigital number, since it uses as much as digits as its factorization.

212056261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331462.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 212056261 is about 14562.1516610699. The cubic root of 212056261 is about 596.3259378485.

The spelling of 212056261 in words is "two hundred twelve million, fifty-six thousand, two hundred sixty-one".