21110533320 has 64 divisors (see below), whose sum is σ = 63381424320. Its totient is φ = 5625046784.

The previous prime is 21110533289. The next prime is 21110533351. The reversal of 21110533320 is 2333501112.

It is an interprime number because it is at equal distance from previous prime (21110533289) and next prime (21110533351).

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, 85402 + ... + 222518.

It is an arithmetic number, because the mean of its divisors is an integer number (990334755).

Almost surely, 2^21110533320 is an apocalyptic number.

21110533320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110533320 is an abundant number, since it is smaller than the sum of its proper divisors (42270891000).

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

21110533320 is a wasteful number, since it uses less digits than its factorization.

21110533320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138414 (or 138410 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The spelling of 21110533320 in words is "twenty-one billion, one hundred ten million, five hundred thirty-three thousand, three hundred twenty".