42212391 has 8 divisors (see below), whose sum is σ = 60612720. Its totient is φ = 25976832.

The previous prime is 42212351. The next prime is 42212399. The reversal of 42212391 is 19321224.

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

It is not a de Polignac number, because 42212391 - 2¹⁸ = 41950247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42212399) 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, 541146 + ... + 541223.

It is an arithmetic number, because the mean of its divisors is an integer number (7576590).

Almost surely, 2^42212391 is an apocalyptic number.

42212391 is a deficient number, since it is larger than the sum of its proper divisors (18400329).

42212391 is a wasteful number, since it uses less digits than its factorization.

42212391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082385.

The product of its digits is 864, while the sum is 24.

The square root of 42212391 is about 6497.1063559095. The cubic root of 42212391 is about 348.1876135272.

The spelling of 42212391 in words is "forty-two million, two hundred twelve thousand, three hundred ninety-one".