21425533244 has 12 divisors (see below), whose sum is σ = 37685012904. Its totient is φ = 10658386704.

The previous prime is 21425533237. The next prime is 21425533247. The reversal of 21425533244 is 44233552412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425533247) 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, 13594094 + ... + 13595669.

It is an arithmetic number, because the mean of its divisors is an integer number (3140417742).

Almost surely, 2^21425533244 is an apocalyptic number.

It is an amenable number.

21425533244 is a deficient number, since it is larger than the sum of its proper divisors (16259479660).

21425533244 is a wasteful number, since it uses less digits than its factorization.

21425533244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27189964 (or 27189962 counting only the distinct ones).

The product of its digits is 115200, while the sum is 35.

The spelling of 21425533244 in words is "twenty-one billion, four hundred twenty-five million, five hundred thirty-three thousand, two hundred forty-four".