21227211044 has 24 divisors (see below), whose sum is σ = 40022108280. Its totient is φ = 9793016064.

The previous prime is 21227211023. The next prime is 21227211067. The reversal of 21227211044 is 44011272212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1024000000 + 20203211044 = 32000^2 + 142138^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38792 + ... + 209664.

It is an arithmetic number, because the mean of its divisors is an integer number (1667587845).

Almost surely, 2^21227211044 is an apocalyptic number.

It is an amenable number.

21227211044 is a deficient number, since it is larger than the sum of its proper divisors (18794897236).

21227211044 is a wasteful number, since it uses less digits than its factorization.

21227211044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173279 (or 173277 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

Adding to 21227211044 its reverse (44011272212), we get a palindrome (65238483256).

The spelling of 21227211044 in words is "twenty-one billion, two hundred twenty-seven million, two hundred eleven thousand, forty-four".