21221402244 has 48 divisors (see below), whose sum is σ = 58119884928. Its totient is φ = 5899385088.

The previous prime is 21221402231. The next prime is 21221402261. The reversal of 21221402244 is 44220412212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3410889 + ... + 3417104.

It is an arithmetic number, because the mean of its divisors is an integer number (1210830936).

Almost surely, 2^21221402244 is an apocalyptic number.

It is an amenable number.

21221402244 is an abundant number, since it is smaller than the sum of its proper divisors (36898482684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221402244 is a wasteful number, since it uses less digits than its factorization.

21221402244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6828044 (or 6828042 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21221402244 its reverse (44220412212), we get a palindrome (65441814456).

The spelling of 21221402244 in words is "twenty-one billion, two hundred twenty-one million, four hundred two thousand, two hundred forty-four".