21041812244 has 12 divisors (see below), whose sum is σ = 36932441364. Its totient is φ = 10489686144.

The previous prime is 21041812243. The next prime is 21041812249. The reversal of 21041812244 is 44221814012.

It can be written as a sum of positive squares in 2 ways, for example, as 11111689744 + 9930122500 = 105412^2 + 99650^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041812243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7803479 + ... + 7806174.

It is an arithmetic number, because the mean of its divisors is an integer number (3077703447).

Almost surely, 2^21041812244 is an apocalyptic number.

It is an amenable number.

21041812244 is a deficient number, since it is larger than the sum of its proper divisors (15890629120).

21041812244 is a wasteful number, since it uses less digits than its factorization.

21041812244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15609994 (or 15609992 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The spelling of 21041812244 in words is "twenty-one billion, forty-one million, eight hundred twelve thousand, two hundred forty-four".