220021999 has 8 divisors (see below), whose sum is σ = 221725728. Its totient is φ = 218323200.

The previous prime is 220021981. The next prime is 220022009. The reversal of 220021999 is 999120022.

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-220021999 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 (220025999) 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, 182599 + ... + 183799.

It is an arithmetic number, because the mean of its divisors is an integer number (27715716).

Almost surely, 2^220021999 is an apocalyptic number.

220021999 is a deficient number, since it is larger than the sum of its proper divisors (1703729).

220021999 is a wasteful number, since it uses less digits than its factorization.

220021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 220021999 is about 14833.1385417922. The cubic root of 220021999 is about 603.7011947969.

The spelling of 220021999 in words is "two hundred twenty million, twenty-one thousand, nine hundred ninety-nine".