201231212 has 24 divisors (see below), whose sum is σ = 433421856. Its totient is φ = 79607808.

The previous prime is 201231211. The next prime is 201231221. The reversal of 201231212 is 212132102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (201231211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276053 + ... + 276780.

It is an arithmetic number, because the mean of its divisors is an integer number (18059244).

Almost surely, 2^201231212 is an apocalyptic number.

It is an amenable number.

201231212 is an abundant number, since it is smaller than the sum of its proper divisors (232190644).

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

201231212 is a wasteful number, since it uses less digits than its factorization.

201231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552857 (or 552855 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 201231212 is about 14185.5987536656. The cubic root of 201231212 is about 586.0011221231.

Adding to 201231212 its reverse (212132102), we get a palindrome (413363314).

The spelling of 201231212 in words is "two hundred one million, two hundred thirty-one thousand, two hundred twelve".