21401469 has 8 divisors (see below), whose sum is σ = 31705920. Its totient is φ = 14267628.

The previous prime is 21401461. The next prime is 21401473. The reversal of 21401469 is 96410412.

It is not a de Polignac number, because 21401469 - 2³ = 21401461 is a prime.

It is a super-2 number, since 2×21401469² = 916045750715922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 792647 = 21401469 / (2 + 1 + 4 + 0 + 1 + 4 + 6 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401461) 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, 396297 + ... + 396350.

It is an arithmetic number, because the mean of its divisors is an integer number (3963240).

Almost surely, 2^21401469 is an apocalyptic number.

It is an amenable number.

21401469 is a deficient number, since it is larger than the sum of its proper divisors (10304451).

21401469 is an equidigital number, since it uses as much as digits as its factorization.

21401469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792656 (or 792650 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21401469 is about 4626.1721757842. The cubic root of 21401469 is about 277.6394624045.

The spelling of 21401469 in words is "twenty-one million, four hundred one thousand, four hundred sixty-nine".