212221412 has 96 divisors (see below), whose sum is σ = 447820800. Its totient is φ = 87609600.

The previous prime is 212221411. The next prime is 212221423. The reversal of 212221412 is 214122212.

It is a super-2 number, since 2×212221412² = 90075855422547488, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (212221411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5176112 + ... + 5176152.

It is an arithmetic number, because the mean of its divisors is an integer number (4664800).

Almost surely, 2^212221412 is an apocalyptic number.

It is an amenable number.

212221412 is an abundant number, since it is smaller than the sum of its proper divisors (235599388).

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

212221412 is a wasteful number, since it uses less digits than its factorization.

212221412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 106 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 212221412 is about 14567.8211136738. The cubic root of 212221412 is about 596.4807053756.

Adding to 212221412 its reverse (214122212), we get a palindrome (426343624).

The spelling of 212221412 in words is "two hundred twelve million, two hundred twenty-one thousand, four hundred twelve".