42202739721 has 16 divisors (see below), whose sum is σ = 58742951040. Its totient is φ = 26899931520.

The previous prime is 42202739639. The next prime is 42202739729. The reversal of 42202739721 is 12793720224.

42202739721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-42202739721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42202739721.

It is not an unprimeable number, because it can be changed into a prime (42202739729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21781 + ... + 291341.

It is an arithmetic number, because the mean of its divisors is an integer number (3671434440).

Almost surely, 2^42202739721 is an apocalyptic number.

It is an amenable number.

42202739721 is a deficient number, since it is larger than the sum of its proper divisors (16540211319).

42202739721 is a wasteful number, since it uses less digits than its factorization.

42202739721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271856.

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 42202739721 in words is "forty-two billion, two hundred two million, seven hundred thirty-nine thousand, seven hundred twenty-one".