21881469 has 8 divisors (see below), whose sum is σ = 29198592. Its totient is φ = 14576000.

The previous prime is 21881459. The next prime is 21881477. The reversal of 21881469 is 96418812.

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 21881469 - 2¹³ = 21873277 is a prime.

It is a super-2 number, since 2×21881469² = 957597371195922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21881459) 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, 3469 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (3649824).

Almost surely, 2^21881469 is an apocalyptic number.

It is an amenable number.

21881469 is a deficient number, since it is larger than the sum of its proper divisors (7317123).

21881469 is a wasteful number, since it uses less digits than its factorization.

21881469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5827.

The product of its digits is 27648, while the sum is 39.

The square root of 21881469 is about 4677.7632475362. The cubic root of 21881469 is about 279.6998015604.

The spelling of 21881469 in words is "twenty-one million, eight hundred eighty-one thousand, four hundred sixty-nine".