21223414145 has 16 divisors (see below), whose sum is σ = 25671900672. Its totient is φ = 16842958080.

The previous prime is 21223414133. The next prime is 21223414169. The reversal of 21223414145 is 54141432212.

It is a happy number.

It is not a de Polignac number, because 21223414145 - 2¹⁸ = 21223152001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2795024 + ... + 2802606.

It is an arithmetic number, because the mean of its divisors is an integer number (1604493792).

Almost surely, 2^21223414145 is an apocalyptic number.

It is an amenable number.

21223414145 is a deficient number, since it is larger than the sum of its proper divisors (4448486527).

21223414145 is a wasteful number, since it uses less digits than its factorization.

21223414145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11992.

The product of its digits is 7680, while the sum is 29.

Adding to 21223414145 its reverse (54141432212), we get a palindrome (75364846357).

The spelling of 21223414145 in words is "twenty-one billion, two hundred twenty-three million, four hundred fourteen thousand, one hundred forty-five".