201211210120020 has 96 divisors (see below), whose sum is σ = 582837878332416. Its totient is φ = 51811850880000.

The previous prime is 201211210119979. The next prime is 201211210120027. The reversal of 201211210120020 is 20021012112102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211210120027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117506731 + ... + 119206770.

It is an arithmetic number, because the mean of its divisors is an integer number (6071227899296).

Almost surely, 2^{201211210120020} is an apocalyptic number.

201211210120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201211210120020 is an abundant number, since it is smaller than the sum of its proper divisors (381626668212396).

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

201211210120020 is a wasteful number, since it uses less digits than its factorization.

201211210120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236714001 (or 236713999 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201211210120020 its reverse (20021012112102), we get a palindrome (221232222232122).

The spelling of 201211210120020 in words is "two hundred one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty thousand, twenty".