220911999 has 24 divisors (see below), whose sum is σ = 370016640. Its totient is φ = 114758160.

The previous prime is 220911979. The next prime is 220912007. The reversal of 220911999 is 999119022.

It is not a de Polignac number, because 220911999 - 2¹⁶ = 220846463 is a prime.

It is a super-2 number, since 2×220911999² = 97604222604352002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220911999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220911919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40929 + ... + 46010.

It is an arithmetic number, because the mean of its divisors is an integer number (15417360).

Almost surely, 2^220911999 is an apocalyptic number.

220911999 is a deficient number, since it is larger than the sum of its proper divisors (149104641).

220911999 is a wasteful number, since it uses less digits than its factorization.

220911999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86971 (or 86960 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 220911999 is about 14863.1086586891. The cubic root of 220911999 is about 604.5141002170.

It can be divided in two parts, 22091 and 1999, that added together give a triangular number (24090 = T₂₁₉).

The spelling of 220911999 in words is "two hundred twenty million, nine hundred eleven thousand, nine hundred ninety-nine".