221211012212 has 12 divisors (see below), whose sum is σ = 387137698080. Its totient is φ = 110600241336.

The previous prime is 221211012167. The next prime is 221211012221. The reversal of 221211012212 is 212210112122.

It is a super-2 number, since 2×221211012212² (a number of 23 digits) contains 22 as substring.

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, 1220888 + ... + 1390319.

It is an arithmetic number, because the mean of its divisors is an integer number (32261474840).

Almost surely, 2^221211012212 is an apocalyptic number.

It is an amenable number.

221211012212 is a deficient number, since it is larger than the sum of its proper divisors (165926685868).

221211012212 is a wasteful number, since it uses less digits than its factorization.

221211012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632390 (or 2632388 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221211012212 its reverse (212210112122), we get a palindrome (433421124334).

The spelling of 221211012212 in words is "two hundred twenty-one billion, two hundred eleven million, twelve thousand, two hundred twelve".