42110121001 has 4 divisors (see below), whose sum is σ = 45349361092. Its totient is φ = 38870880912.

The previous prime is 42110120999. The next prime is 42110121013. The reversal of 42110121001 is 10012101124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9167871001 + 32942250000 = 95749^2 + 181500^2 .

It is a cyclic number.

It is not a de Polignac number, because 42110121001 - 2¹ = 42110120999 is a prime.

It is a super-2 number, since 2×42110121001² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 3239240077 = 42110121001 / (4 + 2 + 1 + 1 + 0 + 1 + 2 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42110121101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619620026 + ... + 1619620051.

It is an arithmetic number, because the mean of its divisors is an integer number (11337340273).

Almost surely, 2^42110121001 is an apocalyptic number.

It is an amenable number.

42110121001 is a deficient number, since it is larger than the sum of its proper divisors (3239240091).

42110121001 is a wasteful number, since it uses less digits than its factorization.

42110121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239240090.

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

Adding to 42110121001 its reverse (10012101124), we get a palindrome (52122222125).

The spelling of 42110121001 in words is "forty-two billion, one hundred ten million, one hundred twenty-one thousand, one".