211210211211220 has 288 divisors, whose sum is σ = 495308250162432. Its totient is φ = 75587376144384.

The previous prime is 211210211211179. The next prime is 211210211211247. The reversal of 211210211211220 is 22112112012112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4876348284 + ... + 4876391596.

It is an arithmetic number, because the mean of its divisors is an integer number (1719820313064).

Almost surely, 2^{211210211211220} is an apocalyptic number.

211210211211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211210211211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247654125081216).

211210211211220 is an abundant number, since it is smaller than the sum of its proper divisors (284098038951212).

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

211210211211220 is a wasteful number, since it uses less digits than its factorization.

211210211211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43731 (or 43716 counting only the distinct ones).

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

Adding to 211210211211220 its reverse (22112112012112), we get a palindrome (233322323223332).

The spelling of 211210211211220 in words is "two hundred eleven trillion, two hundred ten billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty".