21452464 has 20 divisors (see below), whose sum is σ = 45343080. Its totient is φ = 9751040.

The previous prime is 21452461. The next prime is 21452467. The reversal of 21452464 is 46425412.

It is an interprime number because it is at equal distance from previous prime (21452461) and next prime (21452467).

It is not an unprimeable number, because it can be changed into a prime (21452461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60769 + ... + 61120.

It is an arithmetic number, because the mean of its divisors is an integer number (2267154).

Almost surely, 2^21452464 is an apocalyptic number.

It is an amenable number.

21452464 is an abundant number, since it is smaller than the sum of its proper divisors (23890616).

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

21452464 is a wasteful number, since it uses less digits than its factorization.

21452464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121908 (or 121902 counting only the distinct ones).

The product of its digits is 7680, while the sum is 28.

The square root of 21452464 is about 4631.6804725715. The cubic root of 21452464 is about 277.8598054401.

Adding to 21452464 its reverse (46425412), we get a palindrome (67877876).

The spelling of 21452464 in words is "twenty-one million, four hundred fifty-two thousand, four hundred sixty-four".