21531241353 has 8 divisors (see below), whose sum is σ = 30397046688. Its totient is φ = 13509798464.

The previous prime is 21531241339. The next prime is 21531241357. The reversal of 21531241353 is 35314213512.

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 21531241353 - 2¹³ = 21531233161 is a prime.

It is a super-2 number, since 2×21531241353² (a number of 21 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 21531241353.

It is not an unprimeable number, because it can be changed into a prime (21531241357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211090551 + ... + 211090652.

It is an arithmetic number, because the mean of its divisors is an integer number (3799630836).

Almost surely, 2^21531241353 is an apocalyptic number.

It is an amenable number.

21531241353 is a deficient number, since it is larger than the sum of its proper divisors (8865805335).

21531241353 is a wasteful number, since it uses less digits than its factorization.

21531241353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422181223.

The product of its digits is 10800, while the sum is 30.

Adding to 21531241353 its reverse (35314213512), we get a palindrome (56845454865).

The spelling of 21531241353 in words is "twenty-one billion, five hundred thirty-one million, two hundred forty-one thousand, three hundred fifty-three".