21469811 has 8 divisors (see below), whose sum is σ = 23743344. Its totient is φ = 19249920.

The previous prime is 21469807. The next prime is 21469843. The reversal of 21469811 is 11896412.

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 21469811 - 2² = 21469807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21462811) 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, 12566 + ... + 14171.

It is an arithmetic number, because the mean of its divisors is an integer number (2967918).

Almost surely, 2^21469811 is an apocalyptic number.

21469811 is a deficient number, since it is larger than the sum of its proper divisors (2273533).

21469811 is a wasteful number, since it uses less digits than its factorization.

21469811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26821.

The product of its digits is 3456, while the sum is 32.

The square root of 21469811 is about 4633.5527406084. The cubic root of 21469811 is about 277.9346800625.

The spelling of 21469811 in words is "twenty-one million, four hundred sixty-nine thousand, eight hundred eleven".