42365051021 has 4 divisors (see below), whose sum is σ = 42366628092. Its totient is φ = 42363473952.

The previous prime is 42365051017. The next prime is 42365051039. The reversal of 42365051021 is 12015056324.

42365051021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 37669375396 + 4695675625 = 194086^2 + 68525^2 .

It is a cyclic number.

It is not a de Polignac number, because 42365051021 - 2² = 42365051017 is a prime.

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 (42365051011) 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, 747530 + ... + 802203.

It is an arithmetic number, because the mean of its divisors is an integer number (10591657023).

Almost surely, 2^42365051021 is an apocalyptic number.

It is an amenable number.

42365051021 is a deficient number, since it is larger than the sum of its proper divisors (1577071).

42365051021 is a wasteful number, since it uses less digits than its factorization.

42365051021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577070.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 42365051021 in words is "forty-two billion, three hundred sixty-five million, fifty-one thousand, twenty-one".