21226652881 has 16 divisors (see below), whose sum is σ = 25106941440. Its totient is φ = 17567493120.

The previous prime is 21226652791. The next prime is 21226652903. The reversal of 21226652881 is 18825662212.

It is a cyclic number.

It is not a de Polignac number, because 21226652881 - 2¹³ = 21226644689 is a prime.

It is a super-2 number, since 2×21226652881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21226632881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353401 + ... + 409078.

It is an arithmetic number, because the mean of its divisors is an integer number (1569183840).

Almost surely, 2^21226652881 is an apocalyptic number.

It is an amenable number.

21226652881 is a deficient number, since it is larger than the sum of its proper divisors (3880288559).

21226652881 is an equidigital number, since it uses as much as digits as its factorization.

21226652881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762624.

The product of its digits is 184320, while the sum is 43.

The spelling of 21226652881 in words is "twenty-one billion, two hundred twenty-six million, six hundred fifty-two thousand, eight hundred eighty-one".