211212110221210 has 64 divisors (see below), whose sum is σ = 434775779923968. Its totient is φ = 72368538476544.

The previous prime is 211212110221183. The next prime is 211212110221219. The reversal of 211212110221210 is 12122011212112.

It is a happy number.

It is a super-2 number, since 2×211212110221210² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211212110221219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1564385527 + ... + 1564520533.

It is an arithmetic number, because the mean of its divisors is an integer number (6793371561312).

Almost surely, 2^{211212110221210} is an apocalyptic number.

211212110221210 is an abundant number, since it is smaller than the sum of its proper divisors (223563669702758).

211212110221210 is a wasteful number, since it uses less digits than its factorization.

211212110221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149375.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211212110221210 its reverse (12122011212112), we get a palindrome (223334121433322).

The spelling of 211212110221210 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred ten million, two hundred twenty-one thousand, two hundred ten".