212012561544 has 32 divisors (see below), whose sum is σ = 605750176320. Its totient is φ = 60575017536.

The previous prime is 212012561521. The next prime is 212012561561. The reversal of 212012561544 is 445165210212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630989599 + ... + 630989934.

It is an arithmetic number, because the mean of its divisors is an integer number (18929693010).

Almost surely, 2^212012561544 is an apocalyptic number.

212012561544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

212012561544 is an abundant number, since it is smaller than the sum of its proper divisors (393737614776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212012561544 is a wasteful number, since it uses less digits than its factorization.

212012561544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261979549 (or 1261979545 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 212012561544 its reverse (445165210212), we get a palindrome (657177771756).

The spelling of 212012561544 in words is "two hundred twelve billion, twelve million, five hundred sixty-one thousand, five hundred forty-four".