21464469 has 24 divisors (see below), whose sum is σ = 33546240. Its totient is φ = 13146912.

The previous prime is 21464467. The next prime is 21464473. The reversal of 21464469 is 96446412.

21464469 is a `hidden beast` number, since 2 + 1 + 4 + 644 + 6 + 9 = 666.

It is not a de Polignac number, because 21464469 - 2¹ = 21464467 is a prime.

It is a super-2 number, since 2×21464469² = 921446858903922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464467) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44572 + ... + 45050.

It is an arithmetic number, because the mean of its divisors is an integer number (1397760).

Almost surely, 2^21464469 is an apocalyptic number.

It is an amenable number.

21464469 is a deficient number, since it is larger than the sum of its proper divisors (12081771).

21464469 is a wasteful number, since it uses less digits than its factorization.

21464469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881 (or 878 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 21464469 is about 4632.9762572239. The cubic root of 21464469 is about 277.9116267588.

The spelling of 21464469 in words is "twenty-one million, four hundred sixty-four thousand, four hundred sixty-nine".