21515670750440 has 32 divisors (see below), whose sum is σ = 48663716060160. Its totient is φ = 8561209300800.

The previous prime is 21515670750437. The next prime is 21515670750461. The reversal of 21515670750440 is 4405707651512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1408085996 + ... + 1408101275.

It is an arithmetic number, because the mean of its divisors is an integer number (1520741126880).

Almost surely, 2^{21515670750440} is an apocalyptic number.

21515670750440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21515670750440 is an abundant number, since it is smaller than the sum of its proper divisors (27148045309720).

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

21515670750440 is a wasteful number, since it uses less digits than its factorization.

21515670750440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816187473 (or 2816187469 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 47.

The spelling of 21515670750440 in words is "twenty-one trillion, five hundred fifteen billion, six hundred seventy million, seven hundred fifty thousand, four hundred forty".