42161726021 has 8 divisors (see below), whose sum is σ = 43194631704. Its totient is φ = 41129038080.

The previous prime is 42161725997. The next prime is 42161726023. The reversal of 42161726021 is 12062716124.

It can be written as a sum of positive squares in 4 ways, for example, as 4492350625 + 37669375396 = 67025^2 + 194086^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42161726021 is a prime.

It is a super-2 number, since 2×42161726021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42161726023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379385 + ... + 477761.

It is an arithmetic number, because the mean of its divisors is an integer number (5399328963).

Almost surely, 2^42161726021 is an apocalyptic number.

42161726021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42161726021 is a deficient number, since it is larger than the sum of its proper divisors (1032905683).

42161726021 is a wasteful number, since it uses less digits than its factorization.

42161726021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108871.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 42161726021 in words is "forty-two billion, one hundred sixty-one million, seven hundred twenty-six thousand, twenty-one".