221221100022 has 16 divisors (see below), whose sum is σ = 476476215600. Its totient is φ = 68068030752.

The previous prime is 221221099963. The next prime is 221221100033. The reversal of 221221100022 is 220001122122.

It is a junction number, because it is equal to n+sod(n) for n = 221221099974 and 221221100010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1418083897 + ... + 1418084052.

It is an arithmetic number, because the mean of its divisors is an integer number (29779763475).

Almost surely, 2^221221100022 is an apocalyptic number.

221221100022 is an abundant number, since it is smaller than the sum of its proper divisors (255255115578).

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

221221100022 is a wasteful number, since it uses less digits than its factorization.

221221100022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836167967.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221221100022 its reverse (220001122122), we get a palindrome (441222222144).

The spelling of 221221100022 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, twenty-two".