212561011 has 16 divisors (see below), whose sum is σ = 233694720. Its totient is φ = 192137760.

The previous prime is 212560991. The next prime is 212561021. The reversal of 212561011 is 110165212.

It is a cyclic number.

It is not a de Polignac number, because 212561011 - 2⁷ = 212560883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212561011.

It is not an unprimeable number, because it can be changed into a prime (212561021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330256 + ... + 330898.

It is an arithmetic number, because the mean of its divisors is an integer number (14605920).

Almost surely, 2^212561011 is an apocalyptic number.

212561011 is a deficient number, since it is larger than the sum of its proper divisors (21133709).

212561011 is a wasteful number, since it uses less digits than its factorization.

212561011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 212561011 is about 14579.4722469642. The cubic root of 212561011 is about 596.7987007758.

It can be divided in two parts, 2125 and 61011, that added together give a palindrome (63136).

The spelling of 212561011 in words is "two hundred twelve million, five hundred sixty-one thousand, eleven".