21919069 has 16 divisors (see below), whose sum is σ = 24641280. Its totient is φ = 19388160.

The previous prime is 21919063. The next prime is 21919081. The reversal of 21919069 is 96091912.

It is not a de Polignac number, because 21919069 - 2¹⁹ = 21394781 is a prime.

It is a super-2 number, since 2×21919069² = 960891171653522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23392 + ... + 24310.

It is an arithmetic number, because the mean of its divisors is an integer number (1540080).

Almost surely, 2^21919069 is an apocalyptic number.

It is an amenable number.

21919069 is a deficient number, since it is larger than the sum of its proper divisors (2722211).

21919069 is a wasteful number, since it uses less digits than its factorization.

21919069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 21919069 is about 4681.7805373597. The cubic root of 21919069 is about 279.8599171737.

The spelling of 21919069 in words is "twenty-one million, nine hundred nineteen thousand, sixty-nine".