211211221211020 has 48 divisors (see below), whose sum is σ = 452097450671328. Its totient is φ = 82856482941440.

The previous prime is 211211221210987. The next prime is 211211221211047. The reversal of 211211221211020 is 20112122112112.

It is a happy number.

It is a super-3 number, since 3×211211221211020³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38226934 + ... + 43401853.

It is an arithmetic number, because the mean of its divisors is an integer number (9418696888986).

Almost surely, 2^{211211221211020} is an apocalyptic number.

211211221211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211221211020 is an abundant number, since it is smaller than the sum of its proper divisors (240886229460308).

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

211211221211020 is a wasteful number, since it uses less digits than its factorization.

211211221211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81631290 (or 81631288 counting only the distinct ones).

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

Adding to 211211221211020 its reverse (20112122112112), we get a palindrome (231323343323132).

The spelling of 211211221211020 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, twenty".