211221222220210 has 16 divisors (see below), whose sum is σ = 380198879991000. Its totient is φ = 84488337778176.

The previous prime is 211221222220207. The next prime is 211221222220319. The reversal of 211221222220210 is 12022222122112.

It can be written as a sum of positive squares in 4 ways, for example, as 49980672229401 + 161240549990809 = 7069701^2 + 12698053^2 .

It is a super-2 number, since 2×211221222220210² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12928425 + ... + 24281404.

Almost surely, 2^{211221222220210} is an apocalyptic number.

211221222220210 is a deficient number, since it is larger than the sum of its proper divisors (168977657770790).

211221222220210 is a wasteful number, since it uses less digits than its factorization.

211221222220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37777485.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211221222220210 its reverse (12022222122112), we get a palindrome (223243444342322).

The spelling of 211221222220210 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred ten".