21436464 has 40 divisors (see below), whose sum is σ = 63289600. Its totient is φ = 6124608.

The previous prime is 21436453. The next prime is 21436501. The reversal of 21436464 is 46463412.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31564 + ... + 32235.

It is an arithmetic number, because the mean of its divisors is an integer number (1582240).

Almost surely, 2^21436464 is an apocalyptic number.

21436464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21436464 is an abundant number, since it is smaller than the sum of its proper divisors (41853136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21436464 is a wasteful number, since it uses less digits than its factorization.

21436464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63817 (or 63811 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

The square root of 21436464 is about 4629.9529155273. The cubic root of 21436464 is about 277.7907090632.

Adding to 21436464 its reverse (46463412), we get a palindrome (67899876).

The spelling of 21436464 in words is "twenty-one million, four hundred thirty-six thousand, four hundred sixty-four".