211221021222210 has 32 divisors (see below), whose sum is σ = 506931901104960. Its totient is φ = 56325444529088.

The previous prime is 211221021222203. The next prime is 211221021222217. The reversal of 211221021222210 is 12222120122112.

It is an interprime number because it is at equal distance from previous prime (211221021222203) and next prime (211221021222217).

It is a super-2 number, since 2×211221021222210² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221021222217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 782881 + ... + 20568299.

It is an arithmetic number, because the mean of its divisors is an integer number (15841621909530).

Almost surely, 2^{211221021222210} is an apocalyptic number.

211221021222210 is an abundant number, since it is smaller than the sum of its proper divisors (295710879882750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221021222210 is a wasteful number, since it uses less digits than its factorization.

211221021222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20141282.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211221021222210 its reverse (12222120122112), we get a palindrome (223443141344322).

The spelling of 211221021222210 in words is "two hundred eleven trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred ten".