21152515325510 has 128 divisors (see below), whose sum is σ = 43410826368000. Its totient is φ = 7377517711872.

The previous prime is 21152515325429. The next prime is 21152515325569. The reversal of 21152515325510 is 1552351525112.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36847061 + ... + 37416719.

It is an arithmetic number, because the mean of its divisors is an integer number (339147081000).

Almost surely, 2^{21152515325510} is an apocalyptic number.

21152515325510 is an abundant number, since it is smaller than the sum of its proper divisors (22258311042490).

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

21152515325510 is a wasteful number, since it uses less digits than its factorization.

21152515325510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570030.

The product of its (nonzero) digits is 75000, while the sum is 38.

The spelling of 21152515325510 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, three hundred twenty-five thousand, five hundred ten".