212436561 has 16 divisors (see below), whose sum is σ = 290298816. Its totient is φ = 138131136.

The previous prime is 212436559. The next prime is 212436577. The reversal of 212436561 is 165634212.

It is not a de Polignac number, because 212436561 - 2¹ = 212436559 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (212436541) 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, 23646 + ... + 31368.

It is an arithmetic number, because the mean of its divisors is an integer number (18143676).

Almost surely, 2^212436561 is an apocalyptic number.

It is an amenable number.

212436561 is a deficient number, since it is larger than the sum of its proper divisors (77862255).

212436561 is a wasteful number, since it uses less digits than its factorization.

212436561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7952.

The product of its digits is 8640, while the sum is 30.

The square root of 212436561 is about 14575.2036349411. The cubic root of 212436561 is about 596.6822070100.

The spelling of 212436561 in words is "two hundred twelve million, four hundred thirty-six thousand, five hundred sixty-one".