21515617017060 has 48 divisors (see below), whose sum is σ = 60840200215872. Its totient is φ = 5680690960000.

The previous prime is 21515617017047. The next prime is 21515617017061. The reversal of 21515617017060 is 6071071651512.

It is not an unprimeable number, because it can be changed into a prime (21515617017061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775209866 + ... + 1775221985.

It is an arithmetic number, because the mean of its divisors is an integer number (1267504171164).

Almost surely, 2^{21515617017060} is an apocalyptic number.

21515617017060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21515617017060 is an abundant number, since it is smaller than the sum of its proper divisors (39324583198812).

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

21515617017060 is a wasteful number, since it uses less digits than its factorization.

21515617017060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550431964 (or 3550431962 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 42.

Adding to 21515617017060 its reverse (6071071651512), we get a palindrome (27586688668572).

The spelling of 21515617017060 in words is "twenty-one trillion, five hundred fifteen billion, six hundred seventeen million, seventeen thousand, sixty".