21222021020001 has 16 divisors (see below), whose sum is σ = 29534320462464. Its totient is φ = 13529202393344.

The previous prime is 21222021019993. The next prime is 21222021020111. The reversal of 21222021020001 is 10002012022212.

It is a cyclic number.

It is not a de Polignac number, because 21222021020001 - 2³ = 21222021019993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222021022001) 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 15 ways as a sum of consecutive naturals, for example, 41569176 + ... + 42076601.

It is an arithmetic number, because the mean of its divisors is an integer number (1845895028904).

Almost surely, 2^{21222021020001} is an apocalyptic number.

It is an amenable number.

21222021020001 is a deficient number, since it is larger than the sum of its proper divisors (8312299442463).

21222021020001 is a wasteful number, since it uses less digits than its factorization.

21222021020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83649480.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222021020001 its reverse (10002012022212), we get a palindrome (31224033042213).

The spelling of 21222021020001 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, twenty thousand, one".