421870019 has 4 divisors (see below), whose sum is σ = 425603496. Its totient is φ = 418136544.

The previous prime is 421869949. The next prime is 421870021. The reversal of 421870019 is 910078124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421870019 - 2¹⁶ = 421804483 is a prime.

It is a super-3 number, since 3×421870019³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421870219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1866569 + ... + 1866794.

It is an arithmetic number, because the mean of its divisors is an integer number (106400874).

Almost surely, 2^421870019 is an apocalyptic number.

421870019 is a deficient number, since it is larger than the sum of its proper divisors (3733477).

421870019 is a wasteful number, since it uses less digits than its factorization.

421870019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3733476.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 421870019 is about 20539.4746524832. The cubic root of 421870019 is about 749.9970482847.

The spelling of 421870019 in words is "four hundred twenty-one million, eight hundred seventy thousand, nineteen".