21523151044 has 24 divisors (see below), whose sum is σ = 37774447200. Its totient is φ = 10730496960.

The previous prime is 21523150963. The next prime is 21523151051. The reversal of 21523151044 is 44015132512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2205127 + ... + 2214865.

It is an arithmetic number, because the mean of its divisors is an integer number (1573935300).

Almost surely, 2^21523151044 is an apocalyptic number.

It is an amenable number.

21523151044 is a deficient number, since it is larger than the sum of its proper divisors (16251296156).

21523151044 is a wasteful number, since it uses less digits than its factorization.

21523151044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11283 (or 11281 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21523151044 its reverse (44015132512), we get a palindrome (65538283556).

The spelling of 21523151044 in words is "twenty-one billion, five hundred twenty-three million, one hundred fifty-one thousand, forty-four".