21111530355 has 48 divisors (see below), whose sum is σ = 36785810880. Its totient is φ = 11200425984.

The previous prime is 21111530261. The next prime is 21111530383. The reversal of 21111530355 is 55303511112.

It is not a de Polignac number, because 21111530355 - 2⁹ = 21111529843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7734631 + ... + 7737359.

It is an arithmetic number, because the mean of its divisors is an integer number (766371060).

Almost surely, 2^21111530355 is an apocalyptic number.

21111530355 is a deficient number, since it is larger than the sum of its proper divisors (15674280525).

21111530355 is a wasteful number, since it uses less digits than its factorization.

21111530355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580 (or 3577 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The spelling of 21111530355 in words is "twenty-one billion, one hundred eleven million, five hundred thirty thousand, three hundred fifty-five".