21500040543330 has 32 divisors (see below), whose sum is σ = 51618196456128. Its totient is φ = 5731333128000.

The previous prime is 21500040543271. The next prime is 21500040543361. The reversal of 21500040543330 is 3334504000512.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 125601601 + ... + 125772660.

It is an arithmetic number, because the mean of its divisors is an integer number (1613068639254).

Almost surely, 2^{21500040543330} is an apocalyptic number.

21500040543330 is an abundant number, since it is smaller than the sum of its proper divisors (30118155912798).

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

21500040543330 is a wasteful number, since it uses less digits than its factorization.

21500040543330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251377122.

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 21500040543330 its reverse (3334504000512), we get a palindrome (24834544543842).

The spelling of 21500040543330 in words is "twenty-one trillion, five hundred billion, forty million, five hundred forty-three thousand, three hundred thirty".