21301376 has 16 divisors (see below), whose sum is σ = 42436590. Its totient is φ = 10650624.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301376 is 67310312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 141376 = 4600^2 + 376^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83081 + ... + 83336.

Almost surely, 2^21301376 is an apocalyptic number.

It is an amenable number.

21301376 is a deficient number, since it is larger than the sum of its proper divisors (21135214).

21301376 is an equidigital number, since it uses as much as digits as its factorization.

21301376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166431 (or 166419 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21301376 is about 4615.3413741564. The cubic root of 21301376 is about 277.2059531728.

Adding to 21301376 its reverse (67310312), we get a palindrome (88611688).

The spelling of 21301376 in words is "twenty-one million, three hundred one thousand, three hundred seventy-six".