21222451145 has 32 divisors (see below), whose sum is σ = 29415260160. Its totient is φ = 14397716160.

The previous prime is 21222451121. The next prime is 21222451193. The reversal of 21222451145 is 54115422212.

It is not a de Polignac number, because 21222451145 - 2²⁰ = 21221402569 is a prime.

It is a super-2 number, since 2×21222451145² (a number of 21 digits) contains 22 as substring.

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, 5185550 + ... + 5189640.

It is an arithmetic number, because the mean of its divisors is an integer number (919226880).

Almost surely, 2^21222451145 is an apocalyptic number.

It is an amenable number.

21222451145 is a deficient number, since it is larger than the sum of its proper divisors (8192809015).

21222451145 is a wasteful number, since it uses less digits than its factorization.

21222451145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5645.

The product of its digits is 6400, while the sum is 29.

Adding to 21222451145 its reverse (54115422212), we get a palindrome (75337873357).

The spelling of 21222451145 in words is "twenty-one billion, two hundred twenty-two million, four hundred fifty-one thousand, one hundred forty-five".