21461269 has 4 divisors (see below), whose sum is σ = 22153600. Its totient is φ = 20768940.

The previous prime is 21461249. The next prime is 21461287. The reversal of 21461269 is 96216412.

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 a de Polignac number, because none of the positive numbers 2^k-21461269 is a prime.

It is a super-2 number, since 2×21461269² = 921172134180722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 692299 = 21461269 / (2 + 1 + 4 + 6 + 1 + 2 + 6 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21461269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346119 + ... + 346180.

It is an arithmetic number, because the mean of its divisors is an integer number (5538400).

Almost surely, 2^21461269 is an apocalyptic number.

It is an amenable number.

21461269 is a deficient number, since it is larger than the sum of its proper divisors (692331).

21461269 is an equidigital number, since it uses as much as digits as its factorization.

21461269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692330.

The product of its digits is 5184, while the sum is 31.

The square root of 21461269 is about 4632.6308939953. The cubic root of 21461269 is about 277.8978153852.

The spelling of 21461269 in words is "twenty-one million, four hundred sixty-one thousand, two hundred sixty-nine".