211211111012020 has 72 divisors (see below), whose sum is σ = 519421380748200. Its totient is φ = 71929229702400.

The previous prime is 211211111011963. The next prime is 211211111012023. The reversal of 211211111012020 is 20210111112112.

It can be written as a sum of positive squares in 4 ways, for example, as 9107527265424 + 202103583746596 = 3017868^2 + 14216314^2 .

It is a super-2 number, since 2×211211111012020² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211211111011985 and 211211111012003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211111012023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 723080631 + ... + 723372670.

It is an arithmetic number, because the mean of its divisors is an integer number (7214185843725).

Almost surely, 2^{211211111012020} is an apocalyptic number.

211211111012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211111012020 is an abundant number, since it is smaller than the sum of its proper divisors (308210269736180).

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

211211111012020 is a wasteful number, since it uses less digits than its factorization.

211211111012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446453473 (or 1446453464 counting only the distinct ones).

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

Adding to 211211111012020 its reverse (20210111112112), we get a palindrome (231421222124132).

The spelling of 211211111012020 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred eleven million, twelve thousand, twenty".