21999050 has 12 divisors (see below), whose sum is σ = 40918326. Its totient is φ = 8799600.

The previous prime is 21999041. The next prime is 21999059. The reversal of 21999050 is 5099912.

It is an interprime number because it is at equal distance from previous prime (21999041) and next prime (21999059).

It can be written as a sum of positive squares in 3 ways, for example, as 18003049 + 3996001 = 4243^2 + 1999^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21999050.

It is not an unprimeable number, because it can be changed into a prime (21999059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219941 + ... + 220040.

Almost surely, 2^21999050 is an apocalyptic number.

21999050 is a deficient number, since it is larger than the sum of its proper divisors (18919276).

21999050 is a wasteful number, since it uses less digits than its factorization.

21999050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439993 (or 439988 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 21999050 is about 4690.3144883899. The cubic root of 21999050 is about 280.1998997691.

The spelling of 21999050 in words is "twenty-one million, nine hundred ninety-nine thousand, fifty".