21069889 has 8 divisors (see below), whose sum is σ = 21506688. Its totient is φ = 20637120.

The previous prime is 21069857. The next prime is 21069901. The reversal of 21069889 is 98896012.

It is a happy number.

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 21069889 - 2⁵ = 21069857 is a prime.

It is a super-4 number, since 4×21069889⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21069089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10969 + ... + 12745.

It is an arithmetic number, because the mean of its divisors is an integer number (2688336).

Almost surely, 2^21069889 is an apocalyptic number.

It is an amenable number.

21069889 is a deficient number, since it is larger than the sum of its proper divisors (436799).

21069889 is a wasteful number, since it uses less digits than its factorization.

21069889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 21069889 is about 4590.1948760374. The cubic root of 21069889 is about 276.1981397705.

The spelling of 21069889 in words is "twenty-one million, sixty-nine thousand, eight hundred eighty-nine".