21544260630 has 32 divisors (see below), whose sum is σ = 52035575904. Its totient is φ = 5708541696.

The previous prime is 21544260593. The next prime is 21544260641. The reversal of 21544260630 is 3606244512.

It is a junction number, because it is equal to n+sod(n) for n = 21544260591 and 21544260600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2282367 + ... + 2291786.

It is an arithmetic number, because the mean of its divisors is an integer number (1626111747).

Almost surely, 2^21544260630 is an apocalyptic number.

21544260630 is an abundant number, since it is smaller than the sum of its proper divisors (30491315274).

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

21544260630 is a wasteful number, since it uses less digits than its factorization.

21544260630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4574320.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21544260630 in words is "twenty-one billion, five hundred forty-four million, two hundred sixty thousand, six hundred thirty".