21269153 has 4 divisors (see below), whose sum is σ = 21286080. Its totient is φ = 21252228.

The previous prime is 21269147. The next prime is 21269161. The reversal of 21269153 is 35196212.

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.

It is a cyclic number.

It is not a de Polignac number, because 21269153 - 2⁴ = 21269137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21269123) 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, 6413 + ... + 9146.

It is an arithmetic number, because the mean of its divisors is an integer number (5321520).

Almost surely, 2^21269153 is an apocalyptic number.

It is an amenable number.

21269153 is a deficient number, since it is larger than the sum of its proper divisors (16927).

21269153 is a wasteful number, since it uses less digits than its factorization.

21269153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16926.

The product of its digits is 3240, while the sum is 29.

The square root of 21269153 is about 4611.8491952795. The cubic root of 21269153 is about 277.0661043778.

The spelling of 21269153 in words is "twenty-one million, two hundred sixty-nine thousand, one hundred fifty-three".