21152515325511 has 32 divisors (see below), whose sum is σ = 29992301982720. Its totient is φ = 13214520843776.

The previous prime is 21152515325429. The next prime is 21152515325569. The reversal of 21152515325511 is 11552351525112.

It is a cyclic number.

It is not a de Polignac number, because 21152515325511 - 2¹³ = 21152515317319 is a prime.

It is a super-2 number, since 2×21152515325511² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21152515325511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152515325311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12784390 + ... + 14343836.

It is an arithmetic number, because the mean of its divisors is an integer number (937259436960).

Almost surely, 2^{21152515325511} is an apocalyptic number.

21152515325511 is a deficient number, since it is larger than the sum of its proper divisors (8839786657209).

21152515325511 is a wasteful number, since it uses less digits than its factorization.

21152515325511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560623.

The product of its digits is 75000, while the sum is 39.

The spelling of 21152515325511 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, three hundred twenty-five thousand, five hundred eleven".