201212211144 has 96 divisors (see below), whose sum is σ = 615955816800. Its totient is φ = 54463449600.

The previous prime is 201212211143. The next prime is 201212211173. The reversal of 201212211144 is 441112212102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 201212211144.

It is not an unprimeable number, because it can be changed into a prime (201212211143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4480257 + ... + 4524944.

It is an arithmetic number, because the mean of its divisors is an integer number (6416206425).

Almost surely, 2^201212211144 is an apocalyptic number.

201212211144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

201212211144 is an abundant number, since it is smaller than the sum of its proper divisors (414743605656).

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

201212211144 is a wasteful number, since it uses less digits than its factorization.

201212211144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9005243 (or 9005232 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 201212211144 its reverse (441112212102), we get a palindrome (642324423246).

The spelling of 201212211144 in words is "two hundred one billion, two hundred twelve million, two hundred eleven thousand, one hundred forty-four".