21369801 has 8 divisors (see below), whose sum is σ = 28883680. Its totient is φ = 14051232.

The previous prime is 21369797. The next prime is 21369811. The reversal of 21369801 is 10896312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21369801 - 2² = 21369797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21369811) 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 7 ways as a sum of consecutive naturals, for example, 48571 + ... + 49008.

It is an arithmetic number, because the mean of its divisors is an integer number (3610460).

Almost surely, 2^21369801 is an apocalyptic number.

It is an amenable number.

21369801 is a deficient number, since it is larger than the sum of its proper divisors (7513879).

21369801 is an equidigital number, since it uses as much as digits as its factorization.

21369801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97655.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 21369801 is about 4622.7482085876. The cubic root of 21369801 is about 277.5024527013.

The spelling of 21369801 in words is "twenty-one million, three hundred sixty-nine thousand, eight hundred one".