21121513113224 has 8 divisors (see below), whose sum is σ = 39602837087310. Its totient is φ = 10560756556608.

The previous prime is 21121513113091. The next prime is 21121513113257. The reversal of 21121513113224 is 42231131512112.

It can be written as a sum of positive squares in only one way, i.e., 14408325388900 + 6713187724324 = 3795830^2 + 2590982^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21121513113224² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320094569569 + ... + 1320094569584.

Almost surely, 2^{21121513113224} is an apocalyptic number.

It is an amenable number.

21121513113224 is a deficient number, since it is larger than the sum of its proper divisors (18481323974086).

21121513113224 is a wasteful number, since it uses less digits than its factorization.

21121513113224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640189139159 (or 2640189139155 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

Adding to 21121513113224 its reverse (42231131512112), we get a palindrome (63352644625336).

The spelling of 21121513113224 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred thirteen million, one hundred thirteen thousand, two hundred twenty-four".