21515450020503 has 8 divisors (see below), whose sum is σ = 29115434853888. Its totient is φ = 14129549267064.

The previous prime is 21515450020469. The next prime is 21515450020541. The reversal of 21515450020503 is 30502005451512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21515450020503 - 2⁶ = 21515450020439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515450020543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53521019751 + ... + 53521020152.

It is an arithmetic number, because the mean of its divisors is an integer number (3639429356736).

Almost surely, 2^{21515450020503} is an apocalyptic number.

21515450020503 is a deficient number, since it is larger than the sum of its proper divisors (7599984833385).

21515450020503 is a wasteful number, since it uses less digits than its factorization.

21515450020503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107042039973.

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 21515450020503 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty million, twenty thousand, five hundred three".