21152531410161 has 16 divisors (see below), whose sum is σ = 28802645988480. Its totient is φ = 13805189763200.

The previous prime is 21152531410141. The next prime is 21152531410249. The reversal of 21152531410161 is 16101413525112.

It is a cyclic number.

It is not a de Polignac number, because 21152531410161 - 2⁹ = 21152531409649 is a prime.

It is a super-3 number, since 3×21152531410161³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21152531410141) 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, 392165925 + ... + 392219858.

It is an arithmetic number, because the mean of its divisors is an integer number (1800165374280).

Almost surely, 2^{21152531410161} is an apocalyptic number.

It is an amenable number.

21152531410161 is a deficient number, since it is larger than the sum of its proper divisors (7650114578319).

21152531410161 is a wasteful number, since it uses less digits than its factorization.

21152531410161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784385976.

The product of its (nonzero) digits is 7200, while the sum is 33.

Adding to 21152531410161 its reverse (16101413525112), we get a palindrome (37253944935273).

The spelling of 21152531410161 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred thirty-one million, four hundred ten thousand, one hundred sixty-one".