219020021 has 8 divisors (see below), whose sum is σ = 239073888. Its totient is φ = 198990000.

The previous prime is 219019987. The next prime is 219020029. The reversal of 219020021 is 120020912.

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

It is not a de Polignac number, because 219020021 - 2²² = 214825717 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 (219020029) 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, 17171 + ... + 27071.

It is an arithmetic number, because the mean of its divisors is an integer number (29884236).

Almost surely, 2^219020021 is an apocalyptic number.

It is an amenable number.

219020021 is a deficient number, since it is larger than the sum of its proper divisors (20053867).

219020021 is a wasteful number, since it uses less digits than its factorization.

219020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11923.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 219020021 is about 14799.3250183919. The cubic root of 219020021 is about 602.7833837329.

Adding to 219020021 its reverse (120020912), we get a palindrome (339040933).

The spelling of 219020021 in words is "two hundred nineteen million, twenty thousand, twenty-one".