21210220222001 has 8 divisors (see below), whose sum is σ = 21243322206720. Its totient is φ = 21177128245312.

The previous prime is 21210220221989. The next prime is 21210220222007. The reversal of 21210220222001 is 10022202201212.

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 not a de Polignac number, because 21210220222001 - 2⁴² = 16812173710897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210220222007) 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, 1745561 + ... + 6742953.

It is an arithmetic number, because the mean of its divisors is an integer number (2655415275840).

Almost surely, 2^{21210220222001} is an apocalyptic number.

It is an amenable number.

21210220222001 is a deficient number, since it is larger than the sum of its proper divisors (33101984719).

21210220222001 is an equidigital number, since it uses as much as digits as its factorization.

21210220222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5004015.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21210220222001 its reverse (10022202201212), we get a palindrome (31232422423213).

The spelling of 21210220222001 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, two hundred twenty-two thousand, one".