42021730 has 32 divisors (see below), whose sum is σ = 80832960. Its totient is φ = 15681600.

The previous prime is 42021703. The next prime is 42021743. The reversal of 42021730 is 3712024.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 42021698 and 42021707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11080 + ... + 14380.

It is an arithmetic number, because the mean of its divisors is an integer number (2526030).

Almost surely, 2^42021730 is an apocalyptic number.

42021730 is a deficient number, since it is larger than the sum of its proper divisors (38811230).

42021730 is a wasteful number, since it uses less digits than its factorization.

42021730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 42021730 is about 6482.4169875132. The cubic root of 42021730 is about 347.6626018189.

Adding to 42021730 its reverse (3712024), we get a palindrome (45733754).

The spelling of 42021730 in words is "forty-two million, twenty-one thousand, seven hundred thirty".