21022110121 has 8 divisors (see below), whose sum is σ = 23026246920. Its totient is φ = 19103255808.

The previous prime is 21022110107. The next prime is 21022110139. The reversal of 21022110121 is 12101122012.

It can be written as a sum of positive squares in 4 ways, for example, as 2498900121 + 18523210000 = 49989^2 + 136100^2 .

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 21022110121 - 2⁵ = 21022110089 is a prime.

It is a super-2 number, since 2×21022110121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022110181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21320106 + ... + 21321091.

It is an arithmetic number, because the mean of its divisors is an integer number (2878280865).

Almost surely, 2^21022110121 is an apocalyptic number.

It is an amenable number.

21022110121 is a deficient number, since it is larger than the sum of its proper divisors (2004136799).

21022110121 is a wasteful number, since it uses less digits than its factorization.

21022110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42641243.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21022110121 its reverse (12101122012), we get a palindrome (33123232133).

The spelling of 21022110121 in words is "twenty-one billion, twenty-two million, one hundred ten thousand, one hundred twenty-one".