201211212020 has 96 divisors (see below), whose sum is σ = 522749084928. Its totient is φ = 63349972992.

The previous prime is 201211212001. The next prime is 201211212071. The reversal of 201211212020 is 20212112102.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 201211211986 and 201211212004.

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, 64847 + ... + 637673.

It is an arithmetic number, because the mean of its divisors is an integer number (5445302968).

Almost surely, 2^201211212020 is an apocalyptic number.

201211212020 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 201211212020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261374542464).

201211212020 is an abundant number, since it is smaller than the sum of its proper divisors (321537872908).

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

201211212020 is a wasteful number, since it uses less digits than its factorization.

201211212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573049 (or 573047 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201211212020 its reverse (20212112102), we get a palindrome (221423324122).

The spelling of 201211212020 in words is "two hundred one billion, two hundred eleven million, two hundred twelve thousand, twenty".