21999035 has 8 divisors (see below), whose sum is σ = 26846640. Its totient is φ = 17300704.

The previous prime is 21999013. The next prime is 21999041. The reversal of 21999035 is 53099912.

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

It is a cyclic number.

It is not a de Polignac number, because 21999035 - 2²⁴ = 5221819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21999035.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36992 + ... + 37581.

It is an arithmetic number, because the mean of its divisors is an integer number (3355830).

Almost surely, 2^21999035 is an apocalyptic number.

21999035 is a deficient number, since it is larger than the sum of its proper divisors (4847605).

21999035 is an equidigital number, since it uses as much as digits as its factorization.

21999035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74637.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 21999035 is about 4690.3128893497. The cubic root of 21999035 is about 280.1998360845.

The spelling of 21999035 in words is "twenty-one million, nine hundred ninety-nine thousand, thirty-five".