212400012 has 72 divisors (see below), whose sum is σ = 573496000. Its totient is φ = 60968160.

The previous prime is 212399981. The next prime is 212400037. The reversal of 212400012 is 210004212.

It is a super-2 number, since 2×212400012² = 90227530195200288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23739 + ... + 31437.

Almost surely, 2^212400012 is an apocalyptic number.

212400012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212400012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286748000).

212400012 is an abundant number, since it is smaller than the sum of its proper divisors (361095988).

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

212400012 is a wasteful number, since it uses less digits than its factorization.

212400012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7747 (or 7734 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 212400012 is about 14573.9497734828. The cubic root of 212400012 is about 596.6479859879.

Adding to 212400012 its reverse (210004212), we get a palindrome (422404224).

The spelling of 212400012 in words is "two hundred twelve million, four hundred thousand, twelve".