42015456021 has 64 divisors (see below), whose sum is σ = 76338118656. Its totient is φ = 19879603200.

The previous prime is 42015456013. The next prime is 42015456037. The reversal of 42015456021 is 12065451024.

It is not a de Polignac number, because 42015456021 - 2³ = 42015456013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42015456021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42015456521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50830 + ... + 294303.

It is an arithmetic number, because the mean of its divisors is an integer number (1192783104).

Almost surely, 2^42015456021 is an apocalyptic number.

It is an amenable number.

42015456021 is a deficient number, since it is larger than the sum of its proper divisors (34322662635).

42015456021 is a wasteful number, since it uses less digits than its factorization.

42015456021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345202.

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 42015456021 in words is "forty-two billion, fifteen million, four hundred fifty-six thousand, twenty-one".