212021222 has 32 divisors (see below), whose sum is σ = 382689792. Its totient is φ = 86131584.

The previous prime is 212021213. The next prime is 212021237. The reversal of 212021222 is 222120212.

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

It is a junction number, because it is equal to n+sod(n) for n = 212021197 and 212021206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33473 + ... + 39299.

It is an arithmetic number, because the mean of its divisors is an integer number (11959056).

Almost surely, 2^212021222 is an apocalyptic number.

212021222 is a deficient number, since it is larger than the sum of its proper divisors (170668570).

212021222 is a wasteful number, since it uses less digits than its factorization.

212021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5972.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 212021222 is about 14560.9485267959. The cubic root of 212021222 is about 596.2930915095.

Adding to 212021222 its reverse (222120212), we get a palindrome (434141434).

It can be divided in two parts, 2120212 and 22, that multiplied together give a palindrome (46644664).

The spelling of 212021222 in words is "two hundred twelve million, twenty-one thousand, two hundred twenty-two".