221220212 has 12 divisors (see below), whose sum is σ = 387289056. Its totient is φ = 110566200.

The previous prime is 221220163. The next prime is 221220229. The reversal of 221220212 is 212022122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087 + ... + 21137.

It is an arithmetic number, because the mean of its divisors is an integer number (32274088).

Almost surely, 2^221220212 is an apocalyptic number.

It is an amenable number.

221220212 is a deficient number, since it is larger than the sum of its proper divisors (166068844).

221220212 is a wasteful number, since it uses less digits than its factorization.

221220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21958 (or 21956 counting only the distinct ones).

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

The square root of 221220212 is about 14873.4734342722. The cubic root of 221220212 is about 604.7951058097.

Adding to 221220212 its reverse (212022122), we get a palindrome (433242334).

The spelling of 221220212 in words is "two hundred twenty-one million, two hundred twenty thousand, two hundred twelve".