21301264 has 10 divisors (see below), whose sum is σ = 41271230. Its totient is φ = 10650624.

The previous prime is 21301253. The next prime is 21301277. The reversal of 21301264 is 46210312.

It can be written as a sum of positive squares in only one way, i.e., 21233664 + 67600 = 4608^2 + 260^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665649 + ... + 665680.

It is an arithmetic number, because the mean of its divisors is an integer number (4127123).

Almost surely, 2^21301264 is an apocalyptic number.

It is an amenable number.

21301264 is a deficient number, since it is larger than the sum of its proper divisors (19969966).

21301264 is a wasteful number, since it uses less digits than its factorization.

21301264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331337 (or 1331331 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21301264 is about 4615.3292406935. The cubic root of 21301264 is about 277.2054673337.

Adding to 21301264 its reverse (46210312), we get a palindrome (67511576).

The spelling of 21301264 in words is "twenty-one million, three hundred one thousand, two hundred sixty-four".