21110121129 has 16 divisors (see below), whose sum is σ = 28204001280. Its totient is φ = 14044855440.

The previous prime is 21110121101. The next prime is 21110121139. The reversal of 21110121129 is 92112101112.

It is not a de Polignac number, because 21110121129 - 2⁷ = 21110121001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110121139) 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, 6613924 + ... + 6617114.

It is an arithmetic number, because the mean of its divisors is an integer number (1762750080).

Almost surely, 2^21110121129 is an apocalyptic number.

It is an amenable number.

21110121129 is a deficient number, since it is larger than the sum of its proper divisors (7093880151).

21110121129 is a wasteful number, since it uses less digits than its factorization.

21110121129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6980.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 21110121129 in words is "twenty-one billion, one hundred ten million, one hundred twenty-one thousand, one hundred twenty-nine".