211211112021020 has 96 divisors (see below), whose sum is σ = 471634166384640. Its totient is φ = 79176188851200.

The previous prime is 211211112020999. The next prime is 211211112021113. The reversal of 211211112021020 is 20120211112112.

It is a super-2 number, since 2×211211112021020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 211211112021020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1182324947 + ... + 1182503573.

It is an arithmetic number, because the mean of its divisors is an integer number (4912855899840).

Almost surely, 2^{211211112021020} is an apocalyptic number.

211211112021020 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 211211112021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235817083192320).

211211112021020 is an abundant number, since it is smaller than the sum of its proper divisors (260423054363620).

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

211211112021020 is a wasteful number, since it uses less digits than its factorization.

211211112021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193443 (or 193441 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211211112021020 its reverse (20120211112112), we get a palindrome (231331323133132).

The spelling of 211211112021020 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred twelve million, twenty-one thousand, twenty".