21500003050040 has 32 divisors (see below), whose sum is σ = 48620565290880. Its totient is φ = 8556346388352.

The previous prime is 21500003049979. The next prime is 21500003050093. The reversal of 21500003050040 is 4005030000512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21500003049994 and 21500003050021.

It is a congruent number.

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, 1364205512 + ... + 1364221271.

It is an arithmetic number, because the mean of its divisors is an integer number (1519392665340).

Almost surely, 2^{21500003050040} is an apocalyptic number.

21500003050040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21500003050040 is an abundant number, since it is smaller than the sum of its proper divisors (27120562240840).

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

21500003050040 is a wasteful number, since it uses less digits than its factorization.

21500003050040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728426991 (or 2728426987 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 21500003050040 its reverse (4005030000512), we get a palindrome (25505033050552).

The spelling of 21500003050040 in words is "twenty-one trillion, five hundred billion, three million, fifty thousand, forty".