21440601 has 48 divisors (see below), whose sum is σ = 38997504. Its totient is φ = 11048832.

The previous prime is 21440597. The next prime is 21440609. The reversal of 21440601 is 10604412.

21440601 is a `hidden beast` number, since 21 + 4 + 40 + 601 = 666.

It is not a de Polignac number, because 21440601 - 2² = 21440597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21440609) 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 47 ways as a sum of consecutive naturals, for example, 38215 + ... + 38771.

It is an arithmetic number, because the mean of its divisors is an integer number (812448).

Almost surely, 2^21440601 is an apocalyptic number.

21440601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21440601 is a deficient number, since it is larger than the sum of its proper divisors (17556903).

21440601 is a wasteful number, since it uses less digits than its factorization.

21440601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21440601 is about 4630.3996587768. The cubic root of 21440601 is about 277.8085780899.

The spelling of 21440601 in words is "twenty-one million, four hundred forty thousand, six hundred one".