21152532345261 has 16 divisors (see below), whose sum is σ = 28209868562304. Its totient is φ = 14098442540544.

The previous prime is 21152532345253. The next prime is 21152532345293. The reversal of 21152532345261 is 16254323525112.

It is not a de Polignac number, because 21152532345261 - 2³ = 21152532345253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152532345221) 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, 311064681 + ... + 311132673.

It is an arithmetic number, because the mean of its divisors is an integer number (1763116785144).

Almost surely, 2^{21152532345261} is an apocalyptic number.

It is an amenable number.

21152532345261 is a deficient number, since it is larger than the sum of its proper divisors (7057336217043).

21152532345261 is a wasteful number, since it uses less digits than its factorization.

21152532345261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90340.

The product of its digits is 432000, while the sum is 42.

The spelling of 21152532345261 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred thirty-two million, three hundred forty-five thousand, two hundred sixty-one".