21200220001001 has 8 divisors (see below), whose sum is σ = 21224662166400. Its totient is φ = 21175785035280.

The previous prime is 21200220000983. The next prime is 21200220001007. The reversal of 21200220001001 is 10010002200212.

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-21200220001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200220001007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4103840 + ... + 7696878.

It is an arithmetic number, because the mean of its divisors is an integer number (2653082770800).

Almost surely, 2^{21200220001001} is an apocalyptic number.

It is an amenable number.

21200220001001 is a deficient number, since it is larger than the sum of its proper divisors (24442165399).

21200220001001 is a wasteful number, since it uses less digits than its factorization.

21200220001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3599839.

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

Adding to 21200220001001 its reverse (10010002200212), we get a palindrome (31210222201213).

The spelling of 21200220001001 in words is "twenty-one trillion, two hundred billion, two hundred twenty million, one thousand, one".