42021191 has 8 divisors (see below), whose sum is σ = 43123344. Its totient is φ = 40924800.

The previous prime is 42021173. The next prime is 42021211. The reversal of 42021191 is 19112024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42021191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021121) 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, 16025 + ... + 18461.

It is an arithmetic number, because the mean of its divisors is an integer number (5390418).

Almost surely, 2^42021191 is an apocalyptic number.

42021191 is a deficient number, since it is larger than the sum of its proper divisors (1102153).

42021191 is a wasteful number, since it uses less digits than its factorization.

42021191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 42021191 is about 6482.3754133805. The cubic root of 42021191 is about 347.6611153582.

The spelling of 42021191 in words is "forty-two million, twenty-one thousand, one hundred ninety-one".