42721107 has 32 divisors (see below), whose sum is σ = 67554816. Its totient is φ = 23870880.

The previous prime is 42721103. The next prime is 42721109. The reversal of 42721107 is 70112724.

It is not a de Polignac number, because 42721107 - 2² = 42721103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42721103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51498 + ... + 52320.

It is an arithmetic number, because the mean of its divisors is an integer number (2111088).

Almost surely, 2^42721107 is an apocalyptic number.

42721107 is a deficient number, since it is larger than the sum of its proper divisors (24833709).

42721107 is a wasteful number, since it uses less digits than its factorization.

42721107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 42721107 is about 6536.1385389234. The cubic root of 42721107 is about 349.5807415160.

The spelling of 42721107 in words is "forty-two million, seven hundred twenty-one thousand, one hundred seven".