21222154613 has 16 divisors (see below), whose sum is σ = 23309500032. Its totient is φ = 19161432000.

The previous prime is 21222154601. The next prime is 21222154619. The reversal of 21222154613 is 31645122212.

It is a cyclic number.

It is not a de Polignac number, because 21222154613 - 2⁶ = 21222154549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222154619) 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 15 ways as a sum of consecutive naturals, for example, 1628120 + ... + 1641102.

It is an arithmetic number, because the mean of its divisors is an integer number (1456843752).

Almost surely, 2^21222154613 is an apocalyptic number.

It is an amenable number.

21222154613 is a deficient number, since it is larger than the sum of its proper divisors (2087345419).

21222154613 is a wasteful number, since it uses less digits than its factorization.

21222154613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13996.

The product of its digits is 5760, while the sum is 29.

Adding to 21222154613 its reverse (31645122212), we get a palindrome (52867276825).

The spelling of 21222154613 in words is "twenty-one billion, two hundred twenty-two million, one hundred fifty-four thousand, six hundred thirteen".