212220110201021 has 4 divisors (see below), whose sum is σ = 228544734062652. Its totient is φ = 195895486339392.

The previous prime is 212220110200963. The next prime is 212220110201059. The reversal of 212220110201021 is 120102011022212.

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 48164641005625 + 164055469195396 = 6940075^2 + 12808414^2 .

It is a cyclic number.

It is not a de Polignac number, because 212220110201021 - 2²² = 212220106006717 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 (212220110201081) 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, 8162311930796 + ... + 8162311930821.

It is an arithmetic number, because the mean of its divisors is an integer number (57136183515663).

Almost surely, 2^{212220110201021} is an apocalyptic number.

It is an amenable number.

212220110201021 is a deficient number, since it is larger than the sum of its proper divisors (16324623861631).

212220110201021 is a wasteful number, since it uses less digits than its factorization.

212220110201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16324623861630.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212220110201021 its reverse (120102011022212), we get a palindrome (332322121223233).

The spelling of 212220110201021 in words is "two hundred twelve trillion, two hundred twenty billion, one hundred ten million, two hundred one thousand, twenty-one".