42131300021 has 4 divisors (see below), whose sum is σ = 43584103500. Its totient is φ = 40678496544.

The previous prime is 42131300011. The next prime is 42131300023. The reversal of 42131300021 is 12000313124.

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 8048601796 + 34082698225 = 89714^2 + 184615^2 .

It is a cyclic number.

It is not a de Polignac number, because 42131300021 - 2⁶ = 42131299957 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 (42131300023) 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, 726401696 + ... + 726401753.

It is an arithmetic number, because the mean of its divisors is an integer number (10896025875).

Almost surely, 2^42131300021 is an apocalyptic number.

It is an amenable number.

42131300021 is a deficient number, since it is larger than the sum of its proper divisors (1452803479).

42131300021 is a wasteful number, since it uses less digits than its factorization.

42131300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452803478.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 42131300021 its reverse (12000313124), we get a palindrome (54131613145).

The spelling of 42131300021 in words is "forty-two billion, one hundred thirty-one million, three hundred thousand, twenty-one".