42021020401 has 4 divisors (see below), whose sum is σ = 43848021312. Its totient is φ = 40194019492.

The previous prime is 42021020399. The next prime is 42021020411. The reversal of 42021020401 is 10402012024.

42021020401 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42021020401 - 2¹ = 42021020399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42021020411) 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, 913500421 + ... + 913500466.

It is an arithmetic number, because the mean of its divisors is an integer number (10962005328).

Almost surely, 2^42021020401 is an apocalyptic number.

It is an amenable number.

42021020401 is a deficient number, since it is larger than the sum of its proper divisors (1827000911).

42021020401 is a wasteful number, since it uses less digits than its factorization.

42021020401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827000910.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 42021020401 its reverse (10402012024), we get a palindrome (52423032425).

The spelling of 42021020401 in words is "forty-two billion, twenty-one million, twenty thousand, four hundred one".