212121202011 has 24 divisors (see below), whose sum is σ = 295711945536. Its totient is φ = 135241838160.

The previous prime is 212121202009. The next prime is 212121202079. The reversal of 212121202011 is 110202121212.

It is not a de Polignac number, because 212121202011 - 2¹ = 212121202009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212121202411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15055176 + ... + 15069258.

It is an arithmetic number, because the mean of its divisors is an integer number (12321331064).

Almost surely, 2^212121202011 is an apocalyptic number.

212121202011 is a deficient number, since it is larger than the sum of its proper divisors (83590743525).

212121202011 is a wasteful number, since it uses less digits than its factorization.

212121202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23623 (or 23600 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212121202011 its reverse (110202121212), we get a palindrome (322323323223).

The spelling of 212121202011 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred two thousand, eleven".