21222100002001 has 4 divisors (see below), whose sum is σ = 22144800002112. Its totient is φ = 20299400001892.

The previous prime is 21222100001989. The next prime is 21222100002031. The reversal of 21222100002001 is 10020000122212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21222100002001 - 2²⁷ = 21221965784273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222100002031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461350000021 + ... + 461350000066.

It is an arithmetic number, because the mean of its divisors is an integer number (5536200000528).

Almost surely, 2^{21222100002001} is an apocalyptic number.

It is an amenable number.

21222100002001 is a deficient number, since it is larger than the sum of its proper divisors (922700000111).

21222100002001 is an equidigital number, since it uses as much as digits as its factorization.

21222100002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922700000110.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21222100002001 its reverse (10020000122212), we get a palindrome (31242100124213).

The spelling of 21222100002001 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred million, two thousand, one".