21152543120131 has 4 divisors (see below), whose sum is σ = 21152557258200. Its totient is φ = 21152528982064.

The previous prime is 21152543120129. The next prime is 21152543120141. The reversal of 21152543120131 is 13102134525112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21152543120131 - 2¹ = 21152543120129 is a prime.

It is a super-2 number, since 2×21152543120131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21152543120093 and 21152543120102.

It is not an unprimeable number, because it can be changed into a prime (21152543120141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4517941 + ... + 7919398.

It is an arithmetic number, because the mean of its divisors is an integer number (5288139314550).

Almost surely, 2^{21152543120131} is an apocalyptic number.

21152543120131 is a deficient number, since it is larger than the sum of its proper divisors (14138069).

21152543120131 is a wasteful number, since it uses less digits than its factorization.

21152543120131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14138068.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 21152543120131 its reverse (13102134525112), we get a palindrome (34254677645243).

The spelling of 21152543120131 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred forty-three million, one hundred twenty thousand, one hundred thirty-one".