221012212220 has 48 divisors (see below), whose sum is σ = 480635049888. Its totient is φ = 85314927360.

The previous prime is 221012212207. The next prime is 221012212277. The reversal of 221012212220 is 22212210122.

It is a happy number.

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, 1644374 + ... + 1773693.

It is an arithmetic number, because the mean of its divisors is an integer number (10013230206).

Almost surely, 2^221012212220 is an apocalyptic number.

221012212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012212220 is an abundant number, since it is smaller than the sum of its proper divisors (259622837668).

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

221012212220 is a wasteful number, since it uses less digits than its factorization.

221012212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418190 (or 3418188 counting only the distinct ones).

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

Adding to 221012212220 its reverse (22212210122), we get a palindrome (243224422342).

The spelling of 221012212220 in words is "two hundred twenty-one billion, twelve million, two hundred twelve thousand, two hundred twenty".