2211210022221 has 24 divisors (see below), whose sum is σ = 3280380175800. Its totient is φ = 1434260514816.

The previous prime is 2211210022127. The next prime is 2211210022261. The reversal of 2211210022221 is 1222200121122.

It is a happy number.

2211210022221 is a `hidden beast` number, since 2 + 211 + 210 + 0 + 22 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1885156460100 + 326053562121 = 1373010^2 + 571011^2 .

It is not a de Polignac number, because 2211210022221 - 2²⁷ = 2211075804493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2211210022194 and 2211210022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211210022261) 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 23 ways as a sum of consecutive naturals, for example, 18359205 + ... + 18479253.

It is an arithmetic number, because the mean of its divisors is an integer number (136682507325).

Almost surely, 2^{2211210022221} is an apocalyptic number.

It is an amenable number.

2211210022221 is a deficient number, since it is larger than the sum of its proper divisors (1069170153579).

2211210022221 is a wasteful number, since it uses less digits than its factorization.

2211210022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175405 (or 175402 counting only the distinct ones).

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

Adding to 2211210022221 its reverse (1222200121122), we get a palindrome (3433410143343).

The spelling of 2211210022221 in words is "two trillion, two hundred eleven billion, two hundred ten million, twenty-two thousand, two hundred twenty-one".