42600021 has 16 divisors (see below), whose sum is σ = 58204608. Its totient is φ = 27705600.

The previous prime is 42599993. The next prime is 42600023. The reversal of 42600021 is 12000624.

It is not a de Polignac number, because 42600021 - 2⁵ = 42599989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42600023) 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, 23085 + ... + 24861.

It is an arithmetic number, because the mean of its divisors is an integer number (3637788).

Almost surely, 2^42600021 is an apocalyptic number.

It is an amenable number.

42600021 is a deficient number, since it is larger than the sum of its proper divisors (15604587).

42600021 is a wasteful number, since it uses less digits than its factorization.

42600021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 42600021 is about 6526.8691575670. The cubic root of 42600021 is about 349.2501524810.

Adding to 42600021 its reverse (12000624), we get a palindrome (54600645).

The spelling of 42600021 in words is "forty-two million, six hundred thousand, twenty-one".