21222541065 has 32 divisors (see below), whose sum is σ = 37229184000. Its totient is φ = 10237993920.

The previous prime is 21222541061. The next prime is 21222541091. The reversal of 21222541065 is 56014522212.

It is not a de Polignac number, because 21222541065 - 2² = 21222541061 is a prime.

It is a super-2 number, since 2×21222541065² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222541061) 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 31 ways as a sum of consecutive naturals, for example, 290335 + ... + 356004.

It is an arithmetic number, because the mean of its divisors is an integer number (1163412000).

Almost surely, 2^21222541065 is an apocalyptic number.

It is an amenable number.

21222541065 is a deficient number, since it is larger than the sum of its proper divisors (16006642935).

21222541065 is a wasteful number, since it uses less digits than its factorization.

21222541065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646557.

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 21222541065 in words is "twenty-one billion, two hundred twenty-two million, five hundred forty-one thousand, sixty-five".