2201021212221 has 48 divisors (see below), whose sum is σ = 3659092242624. Its totient is φ = 1262885478912.

The previous prime is 2201021212127. The next prime is 2201021212231. The reversal of 2201021212221 is 1222121201022.

It is a happy number.

2201021212221 is a `hidden beast` number, since 220 + 1 + 0 + 212 + 12 + 221 = 666.

It is not a de Polignac number, because 2201021212221 - 2¹³ = 2201021204029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2201021212194 and 2201021212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201021212231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4958191 + ... + 5383836.

It is an arithmetic number, because the mean of its divisors is an integer number (76231088388).

Almost surely, 2^{2201021212221} is an apocalyptic number.

It is an amenable number.

2201021212221 is a deficient number, since it is larger than the sum of its proper divisors (1458071030403).

2201021212221 is a wasteful number, since it uses less digits than its factorization.

2201021212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10342170 (or 10342167 counting only the distinct ones).

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

Adding to 2201021212221 its reverse (1222121201022), we get a palindrome (3423142413243).

The spelling of 2201021212221 in words is "two trillion, two hundred one billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".