211201212220 has 12 divisors (see below), whose sum is σ = 443522545704. Its totient is φ = 84480484880.

The previous prime is 211201212193. The next prime is 211201212253. The reversal of 211201212220 is 22212102112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 211201212194 and 211201212203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5280030286 + ... + 5280030325.

It is an arithmetic number, because the mean of its divisors is an integer number (36960212142).

Almost surely, 2^211201212220 is an apocalyptic number.

211201212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211201212220 is an abundant number, since it is smaller than the sum of its proper divisors (232321333484).

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

211201212220 is a wasteful number, since it uses less digits than its factorization.

211201212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560060620 (or 10560060618 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211201212220 its reverse (22212102112), we get a palindrome (233413314332).

The spelling of 211201212220 in words is "two hundred eleven billion, two hundred one million, two hundred twelve thousand, two hundred twenty".