21113332401 has 8 divisors (see below), whose sum is σ = 32172697024. Its totient is φ = 12064761360.

The previous prime is 21113332397. The next prime is 21113332403. The reversal of 21113332401 is 10423331112.

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

It is not a de Polignac number, because 21113332401 - 2² = 21113332397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1005396781 = 21113332401 / (2 + 1 + 1 + 1 + 3 + 3 + 3 + 2 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113332403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502698370 + ... + 502698411.

It is an arithmetic number, because the mean of its divisors is an integer number (4021587128).

Almost surely, 2^21113332401 is an apocalyptic number.

21113332401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21113332401 is a deficient number, since it is larger than the sum of its proper divisors (11059364623).

21113332401 is a wasteful number, since it uses less digits than its factorization.

21113332401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005396791.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21113332401 its reverse (10423331112), we get a palindrome (31536663513).

The spelling of 21113332401 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty-two thousand, four hundred one".