42521403021 has 8 divisors (see below), whose sum is σ = 56702387904. Its totient is φ = 28344010080.

The previous prime is 42521403013. The next prime is 42521403047. The reversal of 42521403021 is 12030412524.

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

It is not a de Polignac number, because 42521403021 - 2³ = 42521403013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42521402982 and 42521403000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521473021) 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, 870240 + ... + 917801.

It is an arithmetic number, because the mean of its divisors is an integer number (7087798488).

Almost surely, 2^42521403021 is an apocalyptic number.

It is an amenable number.

42521403021 is a deficient number, since it is larger than the sum of its proper divisors (14180984883).

42521403021 is a wasteful number, since it uses less digits than its factorization.

42521403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795971.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 42521403021 its reverse (12030412524), we get a palindrome (54551815545).

The spelling of 42521403021 in words is "forty-two billion, five hundred twenty-one million, four hundred three thousand, twenty-one".