21441100231531 has 16 divisors (see below), whose sum is σ = 22486569984000. Its totient is φ = 20405075331168.

The previous prime is 21441100231493. The next prime is 21441100231543. The reversal of 21441100231531 is 13513200114412.

It is a cyclic number.

It is not a de Polignac number, because 21441100231531 - 2³⁵ = 21406740493163 is a prime.

It is a super-2 number, since 2×21441100231531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21441100231531.

It is not an unprimeable number, because it can be changed into a prime (21441100231561) 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, 157229605 + ... + 157365913.

It is an arithmetic number, because the mean of its divisors is an integer number (1405410624000).

Almost surely, 2^{21441100231531} is an apocalyptic number.

21441100231531 is a deficient number, since it is larger than the sum of its proper divisors (1045469752469).

21441100231531 is a wasteful number, since it uses less digits than its factorization.

21441100231531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170898.

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 21441100231531 its reverse (13513200114412), we get a palindrome (34954300345943).

The spelling of 21441100231531 in words is "twenty-one trillion, four hundred forty-one billion, one hundred million, two hundred thirty-one thousand, five hundred thirty-one".