212021021121111 has 20 divisors (see below), whose sum is σ = 318143041408192. Its totient is φ = 140713502794848.

The previous prime is 212021021121101. The next prime is 212021021121113. The reversal of 212021021121111 is 111121120120212.

It is a happy number.

212021021121111 is a `hidden beast` number, since 2 + 1 + 20 + 210 + 211 + 211 + 11 = 666.

It is not a de Polignac number, because 212021021121111 - 2¹⁵ = 212021021088343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021021121113) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5868913486 + ... + 5868949611.

Almost surely, 2^{212021021121111} is an apocalyptic number.

212021021121111 is a deficient number, since it is larger than the sum of its proper divisors (106122020287081).

212021021121111 is a wasteful number, since it uses less digits than its factorization.

212021021121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11737863332 (or 11737863323 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212021021121111 its reverse (111121120120212), we get a palindrome (323142141241323).

The spelling of 212021021121111 in words is "two hundred twelve trillion, twenty-one billion, twenty-one million, one hundred twenty-one thousand, one hundred eleven".