212021131212 has 72 divisors (see below), whose sum is σ = 587693892240. Its totient is φ = 63915909120.

The previous prime is 212021131207. The next prime is 212021131213. The reversal of 212021131212 is 212131120212.

212021131212 is a `hidden beast` number, since 212 + 0 + 211 + 31 + 212 = 666.

It is a super-2 number, since 2×212021131212² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (212021131213) 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, 1310637 + ... + 1463492.

It is an arithmetic number, because the mean of its divisors is an integer number (8162415170).

Almost surely, 2^212021131212 is an apocalyptic number.

212021131212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

212021131212 is an abundant number, since it is smaller than the sum of its proper divisors (375672761028).

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

212021131212 is a wasteful number, since it uses less digits than its factorization.

212021131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774343 (or 2774338 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212021131212 its reverse (212131120212), we get a palindrome (424152251424).

The spelling of 212021131212 in words is "two hundred twelve billion, twenty-one million, one hundred thirty-one thousand, two hundred twelve".