21227901945 has 8 divisors (see below), whose sum is σ = 33964643136. Its totient is φ = 11321547696.

The previous prime is 21227901913. The next prime is 21227901953. The reversal of 21227901945 is 54910972212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21227901945 - 2⁵ = 21227901913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21227901897 and 21227901906.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 707596717 + ... + 707596746.

It is an arithmetic number, because the mean of its divisors is an integer number (4245580392).

Almost surely, 2^21227901945 is an apocalyptic number.

It is an amenable number.

21227901945 is a deficient number, since it is larger than the sum of its proper divisors (12736741191).

21227901945 is a wasteful number, since it uses less digits than its factorization.

21227901945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415193471.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 21227901945 in words is "twenty-one billion, two hundred twenty-seven million, nine hundred one thousand, nine hundred forty-five".