1222210012221 has 48 divisors (see below), whose sum is σ = 1982022626688. Its totient is φ = 719232566400.

The previous prime is 1222210012171. The next prime is 1222210012223. The reversal of 1222210012221 is 1222100122221.

It is a happy number.

1222210012221 is a `hidden beast` number, since 1 + 222 + 210 + 0 + 12 + 221 = 666.

It is not a de Polignac number, because 1222210012221 - 2⁹ = 1222210011709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222210012194 and 1222210012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222210012223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1441311 + ... + 2126451.

It is an arithmetic number, because the mean of its divisors is an integer number (41292138056).

Almost surely, 2^{1222210012221} is an apocalyptic number.

1222210012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222210012221 is a deficient number, since it is larger than the sum of its proper divisors (759812614467).

1222210012221 is a wasteful number, since it uses less digits than its factorization.

1222210012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685682 (or 685679 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1222210012221 its reverse (1222100122221), we get a palindrome (2444310134442).

It can be divided in two parts, 1 and 222210012221, that added together give a palindrome (222210012222).

The spelling of 1222210012221 in words is "one trillion, two hundred twenty-two billion, two hundred ten million, twelve thousand, two hundred twenty-one".