21506560262516 has 48 divisors (see below), whose sum is σ = 45580122878976. Its totient is φ = 8667901960704.

The previous prime is 21506560262503. The next prime is 21506560262519. The reversal of 21506560262516 is 61526206560512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506560262519) 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, 17673860 + ... + 18851483.

It is an arithmetic number, because the mean of its divisors is an integer number (949585893312).

Almost surely, 2^{21506560262516} is an apocalyptic number.

It is an amenable number.

21506560262516 is an abundant number, since it is smaller than the sum of its proper divisors (24073562616460).

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

21506560262516 is a wasteful number, since it uses less digits than its factorization.

21506560262516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36526608 (or 36526606 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 21506560262516 in words is "twenty-one trillion, five hundred six billion, five hundred sixty million, two hundred sixty-two thousand, five hundred sixteen".