21521341044 has 72 divisors (see below), whose sum is σ = 62397415808. Its totient is φ = 6126736320.

The previous prime is 21521340991. The next prime is 21521341091. The reversal of 21521341044 is 44014312512.

21521341044 is a `hidden beast` number, since 2 + 1 + 521 + 34 + 104 + 4 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21521340999 and 21521341017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84352 + ... + 223959.

Almost surely, 2^21521341044 is an apocalyptic number.

It is an amenable number.

21521341044 is an abundant number, since it is smaller than the sum of its proper divisors (40876074764).

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

21521341044 is a wasteful number, since it uses less digits than its factorization.

21521341044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308605 (or 308600 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21521341044 its reverse (44014312512), we get a palindrome (65535653556).

The spelling of 21521341044 in words is "twenty-one billion, five hundred twenty-one million, three hundred forty-one thousand, forty-four".