21400376 has 16 divisors (see below), whose sum is σ = 41509800. Its totient is φ = 10331104.

The previous prime is 21400367. The next prime is 21400381. The reversal of 21400376 is 67300412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45890 + ... + 46353.

Almost surely, 2^21400376 is an apocalyptic number.

It is an amenable number.

21400376 is a deficient number, since it is larger than the sum of its proper divisors (20109424).

21400376 is a wasteful number, since it uses less digits than its factorization.

21400376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92278 (or 92274 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21400376 is about 4626.0540420536. The cubic root of 21400376 is about 277.6347358583.

Adding to 21400376 its reverse (67300412), we get a palindrome (88700788).

The spelling of 21400376 in words is "twenty-one million, four hundred thousand, three hundred seventy-six".