21222211401 has 12 divisors (see below), whose sum is σ = 30860040900. Its totient is φ = 14053186080.

The previous prime is 21222211369. The next prime is 21222211403. The reversal of 21222211401 is 10411222212.

21222211401 is a `hidden beast` number, since 21 + 22 + 221 + 1 + 401 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10531685376 + 10690526025 = 102624^2 + 103395^2 .

It is not a de Polignac number, because 21222211401 - 2⁵ = 21222211369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222211403) 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 11 ways as a sum of consecutive naturals, for example, 7911490 + ... + 7914171.

It is an arithmetic number, because the mean of its divisors is an integer number (2571670075).

Almost surely, 2^21222211401 is an apocalyptic number.

It is an amenable number.

21222211401 is a deficient number, since it is larger than the sum of its proper divisors (9637829499).

21222211401 is a wasteful number, since it uses less digits than its factorization.

21222211401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15825816 (or 15825813 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222211401 its reverse (10411222212), we get a palindrome (31633433613).

The spelling of 21222211401 in words is "twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, four hundred one".