21100321001 has 8 divisors (see below), whose sum is σ = 22347724680. Its totient is φ = 19853607168.

The previous prime is 21100320991. The next prime is 21100321019. The reversal of 21100321001 is 10012300112.

It can be written as a sum of positive squares in 4 ways, for example, as 986274025 + 20114046976 = 31405^2 + 141824^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21100321001 - 2²² = 21096126697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100321061) 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, 108806 + ... + 232463.

It is an arithmetic number, because the mean of its divisors is an integer number (2793465585).

Almost surely, 2^21100321001 is an apocalyptic number.

It is an amenable number.

21100321001 is a deficient number, since it is larger than the sum of its proper divisors (1247403679).

21100321001 is a wasteful number, since it uses less digits than its factorization.

21100321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344923.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21100321001 its reverse (10012300112), we get a palindrome (31112621113).

The spelling of 21100321001 in words is "twenty-one billion, one hundred million, three hundred twenty-one thousand, one".