212010101221 has 4 divisors (see below), whose sum is σ = 212135035212. Its totient is φ = 211885167232.

The previous prime is 212010101203. The next prime is 212010101249. The reversal of 212010101221 is 122101010212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 201506721025 + 10503380196 = 448895^2 + 102486^2 .

It is a cyclic number.

It is not a de Polignac number, because 212010101221 - 2¹¹ = 212010099173 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 (212010101621) 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, 62464450 + ... + 62467843.

It is an arithmetic number, because the mean of its divisors is an integer number (53033758803).

Almost surely, 2^212010101221 is an apocalyptic number.

It is an amenable number.

212010101221 is a deficient number, since it is larger than the sum of its proper divisors (124933991).

212010101221 is a wasteful number, since it uses less digits than its factorization.

212010101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124933990.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212010101221 its reverse (122101010212), we get a palindrome (334111111433).

The spelling of 212010101221 in words is "two hundred twelve billion, ten million, one hundred one thousand, two hundred twenty-one".