21220222213001 has 12 divisors (see below), whose sum is σ = 25757998215552. Its totient is φ = 17397946161288.

The previous prime is 21220222212967. The next prime is 21220222213019. The reversal of 21220222213001 is 10031222202212.

It is not a de Polignac number, because 21220222213001 - 2⁴² = 16822175701897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220222213061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9414471905 + ... + 9414474158.

It is an arithmetic number, because the mean of its divisors is an integer number (2146499851296).

Almost surely, 2^{21220222213001} is an apocalyptic number.

It is an amenable number.

21220222213001 is a deficient number, since it is larger than the sum of its proper divisors (4537776002551).

21220222213001 is a wasteful number, since it uses less digits than its factorization.

21220222213001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18828946100 (or 18828946093 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21220222213001 its reverse (10031222202212), we get a palindrome (31251444415213).

The spelling of 21220222213001 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred thirteen thousand, one".