42396801021 has 6 divisors (see below), whose sum is σ = 61239823710. Its totient is φ = 28264534008.

The previous prime is 42396801017. The next prime is 42396801043. The reversal of 42396801021 is 12010869324.

It can be written as a sum of positive squares in only one way, i.e., 40654656900 + 1742144121 = 201630^2 + 41739^2 .

It is not a de Polignac number, because 42396801021 - 2² = 42396801017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42396801011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2355377826 + ... + 2355377843.

It is an arithmetic number, because the mean of its divisors is an integer number (10206637285).

Almost surely, 2^42396801021 is an apocalyptic number.

It is an amenable number.

42396801021 is a deficient number, since it is larger than the sum of its proper divisors (18843022689).

42396801021 is a wasteful number, since it uses less digits than its factorization.

42396801021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710755675 (or 4710755672 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 42396801021 in words is "forty-two billion, three hundred ninety-six million, eight hundred one thousand, twenty-one".