201212111020 has 48 divisors (see below), whose sum is σ = 427174812288. Its totient is φ = 79604121600.

The previous prime is 201212111011. The next prime is 201212111021. The reversal of 201212111020 is 20111212102.

201212111020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×201212111020² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201212111021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3073549 + ... + 3138331.

It is an arithmetic number, because the mean of its divisors is an integer number (8899475256).

Almost surely, 2^201212111020 is an apocalyptic number.

201212111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212111020 is an abundant number, since it is smaller than the sum of its proper divisors (225962701268).

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

201212111020 is a wasteful number, since it uses less digits than its factorization.

201212111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66490 (or 66488 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201212111020 its reverse (20111212102), we get a palindrome (221323323122).

The spelling of 201212111020 in words is "two hundred one billion, two hundred twelve million, one hundred eleven thousand, twenty".