212021022220111 has 4 divisors (see below), whose sum is σ = 228330331621672. Its totient is φ = 195711712818552.

The previous prime is 212021022220079. The next prime is 212021022220121. The reversal of 212021022220111 is 111022220120212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212021022220111 - 2⁵ = 212021022220079 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 (212021022220121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8154654700761 + ... + 8154654700786.

It is an arithmetic number, because the mean of its divisors is an integer number (57082582905418).

Almost surely, 2^{212021022220111} is an apocalyptic number.

212021022220111 is a deficient number, since it is larger than the sum of its proper divisors (16309309401561).

212021022220111 is a wasteful number, since it uses less digits than its factorization.

212021022220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16309309401560.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212021022220111 its reverse (111022220120212), we get a palindrome (323043242340323).

The spelling of 212021022220111 in words is "two hundred twelve trillion, twenty-one billion, twenty-two million, two hundred twenty thousand, one hundred eleven".