42121019 has 8 divisors (see below), whose sum is σ = 44731440. Its totient is φ = 39525376.

The previous prime is 42121007. The next prime is 42121067. The reversal of 42121019 is 91012124.

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

It is a cyclic number.

It is not a de Polignac number, because 42121019 - 2⁴ = 42121003 is a prime.

It is a super-2 number, since 2×42121019² = 3548360483196722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42121099) 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, 2492 + ... + 9510.

It is an arithmetic number, because the mean of its divisors is an integer number (5591430).

Almost surely, 2^42121019 is an apocalyptic number.

42121019 is a deficient number, since it is larger than the sum of its proper divisors (2610421).

42121019 is a wasteful number, since it uses less digits than its factorization.

42121019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389.

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

The square root of 42121019 is about 6490.0708008465. The cubic root of 42121019 is about 347.9362056620.

The spelling of 42121019 in words is "forty-two million, one hundred twenty-one thousand, nineteen".