21376401 has 12 divisors (see below), whose sum is σ = 28944048. Its totient is φ = 14031184.

The previous prime is 21376357. The next prime is 21376403. The reversal of 21376401 is 10467312.

It is not a de Polignac number, because 21376401 - 2⁹ = 21375889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21376403) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 72811 + ... + 73103.

It is an arithmetic number, because the mean of its divisors is an integer number (2412004).

Almost surely, 2^21376401 is an apocalyptic number.

It is an amenable number.

21376401 is a deficient number, since it is larger than the sum of its proper divisors (7567647).

21376401 is an frugal number, since it uses more digits than its factorization.

21376401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21376401 is about 4623.4620145514. The cubic root of 21376401 is about 277.5310183653.

The spelling of 21376401 in words is "twenty-one million, three hundred seventy-six thousand, four hundred one".