42441100021 has 4 divisors (see below), whose sum is σ = 43476248844. Its totient is φ = 41405951200.

The previous prime is 42441100007. The next prime is 42441100043. The reversal of 42441100021 is 12000114424.

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 4005497521 + 38435602500 = 63289^2 + 196050^2 .

It is a cyclic number.

It is not a de Polignac number, because 42441100021 - 2¹³ = 42441091829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42441100081) 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, 517574350 + ... + 517574431.

It is an arithmetic number, because the mean of its divisors is an integer number (10869062211).

Almost surely, 2^42441100021 is an apocalyptic number.

42441100021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42441100021 is a deficient number, since it is larger than the sum of its proper divisors (1035148823).

42441100021 is a wasteful number, since it uses less digits than its factorization.

42441100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035148822.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 42441100021 its reverse (12000114424), we get a palindrome (54441214445).

The spelling of 42441100021 in words is "forty-two billion, four hundred forty-one million, one hundred thousand, twenty-one".