221021122121211 has 8 divisors (see below), whose sum is σ = 294803693498944. Its totient is φ = 147292982745480.

The previous prime is 221021122121171. The next prime is 221021122121251. The reversal of 221021122121211 is 112121221120122.

It is an interprime number because it is at equal distance from previous prime (221021122121171) and next prime (221021122121251).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221021122121211 - 2⁹ = 221021122120699 is a prime.

It is a super-2 number, since 2×221021122121211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021122121251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13607991025 + ... + 13608007266.

It is an arithmetic number, because the mean of its divisors is an integer number (36850461687368).

Almost surely, 2^{221021122121211} is an apocalyptic number.

221021122121211 is a deficient number, since it is larger than the sum of its proper divisors (73782571377733).

221021122121211 is a wasteful number, since it uses less digits than its factorization.

221021122121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27216001001.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221021122121211 its reverse (112121221120122), we get a palindrome (333142343241333).

The spelling of 221021122121211 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".