21200221001 has 8 divisors (see below), whose sum is σ = 21720880608. Its totient is φ = 20679732000.

The previous prime is 21200220959. The next prime is 21200221037. The reversal of 21200221001 is 10012200212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200221901) 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, 230066 + ... + 308756.

It is an arithmetic number, because the mean of its divisors is an integer number (2715110076).

Almost surely, 2^21200221001 is an apocalyptic number.

It is an amenable number.

21200221001 is a deficient number, since it is larger than the sum of its proper divisors (520659607).

21200221001 is an equidigital number, since it uses as much as digits as its factorization.

21200221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85303.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200221001 its reverse (10012200212), we get a palindrome (31212421213).

The spelling of 21200221001 in words is "twenty-one billion, two hundred million, two hundred twenty-one thousand, one".