21501101530516 has 12 divisors (see below), whose sum is σ = 37638230473620. Its totient is φ = 10747321395200.

The previous prime is 21501101530507. The next prime is 21501101530523. The reversal of 21501101530516 is 61503510110512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14482819696900 + 7018281833616 = 3805630^2 + 2649204^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807327535 + ... + 807354166.

It is an arithmetic number, because the mean of its divisors is an integer number (3136519206135).

Almost surely, 2^{21501101530516} is an apocalyptic number.

It is an amenable number.

21501101530516 is a deficient number, since it is larger than the sum of its proper divisors (16137128943104).

21501101530516 is a wasteful number, since it uses less digits than its factorization.

21501101530516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614685034 (or 1614685032 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 21501101530516 in words is "twenty-one trillion, five hundred one billion, one hundred one million, five hundred thirty thousand, five hundred sixteen".