21469755 has 8 divisors (see below), whose sum is σ = 34351632. Its totient is φ = 11450528.

The previous prime is 21469739. The next prime is 21469757. The reversal of 21469755 is 55796412.

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 21469755 - 2⁴ = 21469739 is a prime.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21469757) 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, 715644 + ... + 715673.

It is an arithmetic number, because the mean of its divisors is an integer number (4293954).

Almost surely, 2^21469755 is an apocalyptic number.

21469755 is a deficient number, since it is larger than the sum of its proper divisors (12881877).

21469755 is a wasteful number, since it uses less digits than its factorization.

21469755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431325.

The product of its digits is 75600, while the sum is 39.

The square root of 21469755 is about 4633.5466977252. The cubic root of 21469755 is about 277.9344384154.

The spelling of 21469755 in words is "twenty-one million, four hundred sixty-nine thousand, seven hundred fifty-five".