21222002001 has 8 divisors (see below), whose sum is σ = 28297046464. Its totient is φ = 14147479440.

The previous prime is 21222001981. The next prime is 21222002047. The reversal of 21222002001 is 10020022212.

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

It is not a de Polignac number, because 21222002001 - 2¹⁰ = 21222000977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222502001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22930 + ... + 207291.

It is an arithmetic number, because the mean of its divisors is an integer number (3537130808).

Almost surely, 2^21222002001 is an apocalyptic number.

It is an amenable number.

21222002001 is a deficient number, since it is larger than the sum of its proper divisors (7075044463).

21222002001 is a wasteful number, since it uses less digits than its factorization.

21222002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260951.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21222002001 its reverse (10020022212), we get a palindrome (31242024213).

The spelling of 21222002001 in words is "twenty-one billion, two hundred twenty-two million, two thousand, one".