21110121102021 has 32 divisors (see below), whose sum is σ = 32285381952768. Its totient is φ = 12018838371840.

The previous prime is 21110121102019. The next prime is 21110121102029. The reversal of 21110121102021 is 12020112101112.

It is a happy number.

It is not a de Polignac number, because 21110121102021 - 2¹ = 21110121102019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110121102029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154856031 + ... + 154992291.

It is an arithmetic number, because the mean of its divisors is an integer number (1008918186024).

Almost surely, 2^{21110121102021} is an apocalyptic number.

21110121102021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21110121102021 is a deficient number, since it is larger than the sum of its proper divisors (11175260850747).

21110121102021 is a wasteful number, since it uses less digits than its factorization.

21110121102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163181.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21110121102021 its reverse (12020112101112), we get a palindrome (33130233203133).

Subtracting from 21110121102021 its reverse (12020112101112), we obtain a palindrome (9090009000909).

The spelling of 21110121102021 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, one hundred two thousand, twenty-one".