201211001020 has 48 divisors (see below), whose sum is σ = 437160830400. Its totient is φ = 77700672000.

The previous prime is 201211000987. The next prime is 201211001021. The reversal of 201211001020 is 20100112102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 201211000988 and 201211001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211001021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9570520 + ... + 9591520.

It is an arithmetic number, because the mean of its divisors is an integer number (9107517300).

Almost surely, 2^201211001020 is an apocalyptic number.

201211001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201211001020 is an abundant number, since it is smaller than the sum of its proper divisors (235949829380).

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

201211001020 is a wasteful number, since it uses less digits than its factorization.

201211001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37558 (or 37556 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 201211001020 its reverse (20100112102), we get a palindrome (221311113122).

The spelling of 201211001020 in words is "two hundred one billion, two hundred eleven million, one thousand, twenty".