21242355044 has 24 divisors (see below), whose sum is σ = 37903057920. Its totient is φ = 10413851744.

The previous prime is 21242355041. The next prime is 21242355067. The reversal of 21242355044 is 44055324212.

It is a self number, because there is not a number n which added to its sum of digits gives 21242355044.

It is not an unprimeable number, because it can be changed into a prime (21242355041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27119 + ... + 207894.

It is an arithmetic number, because the mean of its divisors is an integer number (1579294080).

Almost surely, 2^21242355044 is an apocalyptic number.

It is an amenable number.

21242355044 is a deficient number, since it is larger than the sum of its proper divisors (16660702876).

21242355044 is a wasteful number, since it uses less digits than its factorization.

21242355044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235459 (or 235457 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 21242355044 its reverse (44055324212), we get a palindrome (65297679256).

The spelling of 21242355044 in words is "twenty-one billion, two hundred forty-two million, three hundred fifty-five thousand, forty-four".