21122110121 has 16 divisors (see below), whose sum is σ = 25055966208. Its totient is φ = 17423812800.

The previous prime is 21122110111. The next prime is 21122110127. The reversal of 21122110121 is 12101122112.

It is a cyclic number.

It is not a de Polignac number, because 21122110121 - 2¹⁸ = 21121847977 is a prime.

It is a super-2 number, since 2×21122110121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122110096 and 21122110105.

It is not an unprimeable number, because it can be changed into a prime (21122110127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229610 + ... + 308163.

It is an arithmetic number, because the mean of its divisors is an integer number (1565997888).

Almost surely, 2^21122110121 is an apocalyptic number.

It is an amenable number.

21122110121 is a deficient number, since it is larger than the sum of its proper divisors (3933856087).

21122110121 is a wasteful number, since it uses less digits than its factorization.

21122110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537992.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21122110121 its reverse (12101122112), we get a palindrome (33223232233).

The spelling of 21122110121 in words is "twenty-one billion, one hundred twenty-two million, one hundred ten thousand, one hundred twenty-one".