21201464 has 8 divisors (see below), whose sum is σ = 39752760. Its totient is φ = 10600728.

The previous prime is 21201461. The next prime is 21201487. The reversal of 21201464 is 46410212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325084 + ... + 1325099.

It is an arithmetic number, because the mean of its divisors is an integer number (4969095).

Almost surely, 2^21201464 is an apocalyptic number.

It is an amenable number.

21201464 is a deficient number, since it is larger than the sum of its proper divisors (18551296).

21201464 is a wasteful number, since it uses less digits than its factorization.

21201464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650189 (or 2650185 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21201464 is about 4604.5047507848. The cubic root of 21201464 is about 276.7718714108.

Adding to 21201464 its reverse (46410212), we get a palindrome (67611676).

The spelling of 21201464 in words is "twenty-one million, two hundred one thousand, four hundred sixty-four".