21222212001 has 8 divisors (see below), whose sum is σ = 28361937024. Its totient is φ = 14115314160.

The previous prime is 21222211999. The next prime is 21222212029. The reversal of 21222212001 is 10021222212.

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

It is not a de Polignac number, because 21222212001 - 2¹ = 21222211999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222212201) 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, 8205286 + ... + 8207871.

It is an arithmetic number, because the mean of its divisors is an integer number (3545242128).

Almost surely, 2^21222212001 is an apocalyptic number.

It is an amenable number.

21222212001 is a deficient number, since it is larger than the sum of its proper divisors (7139725023).

21222212001 is a wasteful number, since it uses less digits than its factorization.

21222212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16413591.

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

Adding to 21222212001 its reverse (10021222212), we get a palindrome (31243434213).

The spelling of 21222212001 in words is "twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one".