201211000020 has 120 divisors (see below), whose sum is σ = 651568017408. Its totient is φ = 51925406400.

The previous prime is 201210999991. The next prime is 201211000031. The reversal of 201211000020 is 20000112102.

201211000020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 201210999966 and 201211000011.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 1953076 + ... + 2053515.

Almost surely, 2^201211000020 is an apocalyptic number.

201211000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201211000020 is an abundant number, since it is smaller than the sum of its proper divisors (450357017388).

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

201211000020 is a wasteful number, since it uses less digits than its factorization.

201211000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006643 (or 4006632 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 201211000020 its reverse (20000112102), we get a palindrome (221211112122).

The spelling of 201211000020 in words is "two hundred one billion, two hundred eleven million, twenty", and thus it is an aban number.