21153206141531 has 8 divisors (see below), whose sum is σ = 21197377924224. Its totient is φ = 21109065027840.

The previous prime is 21153206141491. The next prime is 21153206141537. The reversal of 21153206141531 is 13514160235112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21153206141531 - 2⁶ = 21153206141467 is a prime.

It is a super-2 number, since 2×21153206141531² (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 = 21153206141491 and 21153206141500.

It is not an unprimeable number, because it can be changed into a prime (21153206141537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6286100 + ... + 9045521.

It is an arithmetic number, because the mean of its divisors is an integer number (2649672240528).

Almost surely, 2^{21153206141531} is an apocalyptic number.

21153206141531 is a deficient number, since it is larger than the sum of its proper divisors (44171782693).

21153206141531 is a wasteful number, since it uses less digits than its factorization.

21153206141531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15334501.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 21153206141531 its reverse (13514160235112), we get a palindrome (34667366376643).

The spelling of 21153206141531 in words is "twenty-one trillion, one hundred fifty-three billion, two hundred six million, one hundred forty-one thousand, five hundred thirty-one".