210122110111021 has 4 divisors (see below), whose sum is σ = 210122248261212. Its totient is φ = 210121971960832.

The previous prime is 210122110110977. The next prime is 210122110111061. The reversal of 210122110111021 is 120111011221012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84702829255396 + 125419280855625 = 9203414^2 + 11199075^2 .

It is a cyclic number.

It is not a de Polignac number, because 210122110111021 - 2⁷ = 210122110110893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210122110110986 and 210122110111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210122110111061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66767956 + ... + 69844141.

It is an arithmetic number, because the mean of its divisors is an integer number (52530562065303).

Almost surely, 2^{210122110111021} is an apocalyptic number.

It is an amenable number.

210122110111021 is a deficient number, since it is larger than the sum of its proper divisors (138150191).

210122110111021 is a wasteful number, since it uses less digits than its factorization.

210122110111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138150190.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 210122110111021 its reverse (120111011221012), we get a palindrome (330233121332033).

The spelling of 210122110111021 in words is "two hundred ten trillion, one hundred twenty-two billion, one hundred ten million, one hundred eleven thousand, twenty-one".