21799601 has 4 divisors (see below), whose sum is σ = 21886704. Its totient is φ = 21712500.

The previous prime is 21799597. The next prime is 21799633. The reversal of 21799601 is 10699712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21799601 - 2² = 21799597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21799691) 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 3 ways as a sum of consecutive naturals, for example, 43175 + ... + 43676.

It is an arithmetic number, because the mean of its divisors is an integer number (5471676).

Almost surely, 2^21799601 is an apocalyptic number.

It is an amenable number.

21799601 is a deficient number, since it is larger than the sum of its proper divisors (87103).

21799601 is an equidigital number, since it uses as much as digits as its factorization.

21799601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87102.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 21799601 is about 4669.0042835705. The cubic root of 21799601 is about 279.3505398094.

The spelling of 21799601 in words is "twenty-one million, seven hundred ninety-nine thousand, six hundred one".