21469153 has 4 divisors (see below), whose sum is σ = 21479680. Its totient is φ = 21458628.

The previous prime is 21469121. The next prime is 21469163. The reversal of 21469153 is 35196412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21469153 - 2⁵ = 21469121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21469163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113 + ... + 6646.

It is an arithmetic number, because the mean of its divisors is an integer number (5369920).

Almost surely, 2^21469153 is an apocalyptic number.

It is an amenable number.

21469153 is a deficient number, since it is larger than the sum of its proper divisors (10527).

21469153 is an equidigital number, since it uses as much as digits as its factorization.

21469153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10526.

The product of its digits is 6480, while the sum is 31.

The square root of 21469153 is about 4633.4817362325. The cubic root of 21469153 is about 277.9318406820.

The spelling of 21469153 in words is "twenty-one million, four hundred sixty-nine thousand, one hundred fifty-three".