105021510121 has 16 divisors (see below), whose sum is σ = 114822344448. Its totient is φ = 95263090000.

The previous prime is 105021510103. The next prime is 105021510133. The reversal of 105021510121 is 121015120501.

It is a cyclic number.

It is not a de Polignac number, because 105021510121 - 2⁵ = 105021510089 is a prime.

It is a super-2 number, since 2×105021510121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105021510101) 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, 20989206 + ... + 20994208.

It is an arithmetic number, because the mean of its divisors is an integer number (7176396528).

Almost surely, 2^105021510121 is an apocalyptic number.

105021510121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

105021510121 is a deficient number, since it is larger than the sum of its proper divisors (9800834327).

105021510121 is a wasteful number, since it uses less digits than its factorization.

105021510121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852.

The product of its (nonzero) digits is 100, while the sum is 19.

Adding to 105021510121 its reverse (121015120501), we get a palindrome (226036630622).

The spelling of 105021510121 in words is "one hundred five billion, twenty-one million, five hundred ten thousand, one hundred twenty-one".