21907869 has 8 divisors (see below), whose sum is σ = 29269920. Its totient is φ = 14575536.

The previous prime is 21907867. The next prime is 21907871. The reversal of 21907869 is 96870912.

It is an interprime number because it is at equal distance from previous prime (21907867) and next prime (21907871).

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

It is not a de Polignac number, because 21907869 - 2¹ = 21907867 is a prime.

It is a super-2 number, since 2×21907869² = 959909448242322, 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 21907869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21907867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5647 + ... + 8700.

It is an arithmetic number, because the mean of its divisors is an integer number (3658740).

Almost surely, 2^21907869 is an apocalyptic number.

It is an amenable number.

21907869 is a deficient number, since it is larger than the sum of its proper divisors (7362051).

21907869 is a wasteful number, since it uses less digits than its factorization.

21907869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14859.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 21907869 is about 4680.5842584019. The cubic root of 21907869 is about 279.8122423220.

The spelling of 21907869 in words is "twenty-one million, nine hundred seven thousand, eight hundred sixty-nine".