42213021 has 8 divisors (see below), whose sum is σ = 56504064. Its totient is φ = 28032000.

The previous prime is 42213013. The next prime is 42213029. The reversal of 42213021 is 12031224.

It is an interprime number because it is at equal distance from previous prime (42213013) and next prime (42213029).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42213021 - 2³ = 42213013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42213029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26605 + ... + 28146.

It is an arithmetic number, because the mean of its divisors is an integer number (7063008).

Almost surely, 2^42213021 is an apocalyptic number.

It is an amenable number.

42213021 is a deficient number, since it is larger than the sum of its proper divisors (14291043).

42213021 is a wasteful number, since it uses less digits than its factorization.

42213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55011.

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

The square root of 42213021 is about 6497.1548388506. The cubic root of 42213021 is about 348.1893456972.

Adding to 42213021 its reverse (12031224), we get a palindrome (54244245).

The spelling of 42213021 in words is "forty-two million, two hundred thirteen thousand, twenty-one".