21222264145 has 32 divisors (see below), whose sum is σ = 26398955520. Its totient is φ = 16368168960.

The previous prime is 21222264083. The next prime is 21222264199. The reversal of 21222264145 is 54146222212.

It is a de Polignac number, because none of the positive numbers 2^k-21222264145 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10042609 + ... + 10044721.

It is an arithmetic number, because the mean of its divisors is an integer number (824967360).

Almost surely, 2^21222264145 is an apocalyptic number.

It is an amenable number.

21222264145 is a deficient number, since it is larger than the sum of its proper divisors (5176691375).

21222264145 is a wasteful number, since it uses less digits than its factorization.

21222264145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785.

The product of its digits is 15360, while the sum is 31.

Adding to 21222264145 its reverse (54146222212), we get a palindrome (75368486357).

The spelling of 21222264145 in words is "twenty-one billion, two hundred twenty-two million, two hundred sixty-four thousand, one hundred forty-five".