21869407 has 8 divisors (see below), whose sum is σ = 25105536. Its totient is φ = 18661272.

The previous prime is 21869401. The next prime is 21869423. The reversal of 21869407 is 70496812.

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

It is not a de Polignac number, because 21869407 - 2⁷ = 21869279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869401) 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, 5293 + ... + 8470.

It is an arithmetic number, because the mean of its divisors is an integer number (3138192).

Almost surely, 2^21869407 is an apocalyptic number.

21869407 is a deficient number, since it is larger than the sum of its proper divisors (3236129).

21869407 is a wasteful number, since it uses less digits than its factorization.

21869407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13997.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21869407 is about 4676.4737783933. The cubic root of 21869407 is about 279.6483979562.

The spelling of 21869407 in words is "twenty-one million, eight hundred sixty-nine thousand, four hundred seven".