21555113530 has 16 divisors (see below), whose sum is σ = 39701512224. Its totient is φ = 8421532560.

The previous prime is 21555113479. The next prime is 21555113549. The reversal of 21555113530 is 3531155512.

It is a junction number, because it is equal to n+sod(n) for n = 21555113492 and 21555113501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25063656 + ... + 25064515.

It is an arithmetic number, because the mean of its divisors is an integer number (2481344514).

Almost surely, 2^21555113530 is an apocalyptic number.

21555113530 is a deficient number, since it is larger than the sum of its proper divisors (18146398694).

21555113530 is a wasteful number, since it uses less digits than its factorization.

21555113530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50128221.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 21555113530 in words is "twenty-one billion, five hundred fifty-five million, one hundred thirteen thousand, five hundred thirty".