212101202020221 has 32 divisors (see below), whose sum is σ = 330763766860800. Its totient is φ = 133957982237040.

The previous prime is 212101202020159. The next prime is 212101202020237. The reversal of 212101202020221 is 122020202101212.

It is a happy number.

212101202020221 is a `hidden beast` number, since 2 + 121 + 0 + 120 + 202 + 0 + 221 = 666.

It is not a de Polignac number, because 212101202020221 - 2¹⁸ = 212101201758077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212101202020194 and 212101202020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101202020241) 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, 113754856 + ... + 115604366.

It is an arithmetic number, because the mean of its divisors is an integer number (10336367714400).

Almost surely, 2^{212101202020221} is an apocalyptic number.

It is an amenable number.

212101202020221 is a deficient number, since it is larger than the sum of its proper divisors (118662564840579).

212101202020221 is a wasteful number, since it uses less digits than its factorization.

212101202020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073086 (or 2073080 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212101202020221 its reverse (122020202101212), we get a palindrome (334121404121433).

The spelling of 212101202020221 in words is "two hundred twelve trillion, one hundred one billion, two hundred two million, twenty thousand, two hundred twenty-one".