221201211221122 has 32 divisors (see below), whose sum is σ = 381043459572480. Its totient is φ = 95247355297680.

The previous prime is 221201211220933. The next prime is 221201211221143. The reversal of 221201211221122 is 221122112102122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 221201211221093 and 221201211221102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12859548 + ... + 24652999.

It is an arithmetic number, because the mean of its divisors is an integer number (11907608111640).

Almost surely, 2^{221201211221122} is an apocalyptic number.

221201211221122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221201211221122 is a deficient number, since it is larger than the sum of its proper divisors (159842248351358).

221201211221122 is a wasteful number, since it uses less digits than its factorization.

221201211221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37526686.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221201211221122 its reverse (221122112102122), we get a palindrome (442323323323244).

The spelling of 221201211221122 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-two".