21055602124331 has 4 divisors (see below), whose sum is σ = 22294166955192. Its totient is φ = 19817037293472.

The previous prime is 21055602124327. The next prime is 21055602124363. The reversal of 21055602124331 is 13342120655012.

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 21055602124331 - 2² = 21055602124327 is a prime.

It is a super-2 number, since 2×21055602124331² (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 = 21055602124291 and 21055602124300.

It is not an unprimeable number, because it can be changed into a prime (21055602124301) 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, 619282415405 + ... + 619282415438.

It is an arithmetic number, because the mean of its divisors is an integer number (5573541738798).

Almost surely, 2^{21055602124331} is an apocalyptic number.

21055602124331 is a deficient number, since it is larger than the sum of its proper divisors (1238564830861).

21055602124331 is a wasteful number, since it uses less digits than its factorization.

21055602124331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238564830860.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 21055602124331 its reverse (13342120655012), we get a palindrome (34397722779343).

The spelling of 21055602124331 in words is "twenty-one trillion, fifty-five billion, six hundred two million, one hundred twenty-four thousand, three hundred thirty-one".