210122100221221 has 8 divisors (see below), whose sum is σ = 211194267258744. Its totient is φ = 209049989319360.

The previous prime is 210122100221179. The next prime is 210122100221261. The reversal of 210122100221221 is 122122001221012.

It can be written as a sum of positive squares in 4 ways, for example, as 126255224232225 + 83866875988996 = 11236335^2 + 9157886^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 210122100221221 - 2²³ = 210122091832613 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 (210122100221261) 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, 6518350 + ... + 21511231.

It is an arithmetic number, because the mean of its divisors is an integer number (26399283407343).

Almost surely, 2^{210122100221221} is an apocalyptic number.

It is an amenable number.

210122100221221 is a deficient number, since it is larger than the sum of its proper divisors (1072167037523).

210122100221221 is a wasteful number, since it uses less digits than its factorization.

210122100221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28067831.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210122100221221 its reverse (122122001221012), we get a palindrome (332244101442233).

The spelling of 210122100221221 in words is "two hundred ten trillion, one hundred twenty-two billion, one hundred million, two hundred twenty-one thousand, two hundred twenty-one".