221022211122221 has 32 divisors (see below), whose sum is σ = 232108748771328. Its totient is φ = 210251436171840.

The previous prime is 221022211122137. The next prime is 221022211122247. The reversal of 221022211122221 is 122221112220122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221022211122221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022211122281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2670695975 + ... + 2670778731.

It is an arithmetic number, because the mean of its divisors is an integer number (7253398399104).

Almost surely, 2^{221022211122221} is an apocalyptic number.

It is an amenable number.

221022211122221 is a deficient number, since it is larger than the sum of its proper divisors (11086537649107).

221022211122221 is a wasteful number, since it uses less digits than its factorization.

221022211122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89321.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221022211122221 its reverse (122221112220122), we get a palindrome (343243323342343).

The spelling of 221022211122221 in words is "two hundred twenty-one trillion, twenty-two billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".