221022221221221 has 16 divisors (see below), whose sum is σ = 351439059830784. Its totient is φ = 120807176816304.

The previous prime is 221022221221183. The next prime is 221022221221223. The reversal of 221022221221221 is 122122122220122.

It is a happy number.

It is not a de Polignac number, because 221022221221221 - 2⁶ = 221022221221157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221022221221191 and 221022221221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022221221223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228801470761 + ... + 228801471726.

It is an arithmetic number, because the mean of its divisors is an integer number (21964941239424).

Almost surely, 2^{221022221221221} is an apocalyptic number.

221022221221221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221022221221221 is a deficient number, since it is larger than the sum of its proper divisors (130416838609563).

221022221221221 is a wasteful number, since it uses less digits than its factorization.

221022221221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457602942520.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 221022221221221 its reverse (122122122220122), we get a palindrome (343144343441343).

The spelling of 221022221221221 in words is "two hundred twenty-one trillion, twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".