212021211111 has 32 divisors (see below), whose sum is σ = 297733708800. Its totient is φ = 134066338560.

The previous prime is 212021211043. The next prime is 212021211113. The reversal of 212021211111 is 111112120212.

It is a happy number.

It is not a de Polignac number, because 212021211111 - 2¹⁴ = 212021194727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021211113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550270 + ... + 852548.

It is an arithmetic number, because the mean of its divisors is an integer number (9304178400).

Almost surely, 2^212021211111 is an apocalyptic number.

212021211111 is a deficient number, since it is larger than the sum of its proper divisors (85712497689).

212021211111 is a wasteful number, since it uses less digits than its factorization.

212021211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302479.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212021211111 its reverse (111112120212), we get a palindrome (323133331323).

It can be divided in two parts, 2120212 and 11111, that multiplied together give a palindrome (23557675532).

The spelling of 212021211111 in words is "two hundred twelve billion, twenty-one million, two hundred eleven thousand, one hundred eleven".