21213124211024 has 10 divisors (see below), whose sum is σ = 41100428158890. Its totient is φ = 10606562105504.

The previous prime is 21213124211021. The next prime is 21213124211053. The reversal of 21213124211024 is 42011242131212.

It can be written as a sum of positive squares in only one way, i.e., 12436907560000 + 8776216651024 = 3526600^2 + 2962468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21213124210984 and 21213124211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213124211021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662910131579 + ... + 662910131610.

It is an arithmetic number, because the mean of its divisors is an integer number (4110042815889).

Almost surely, 2^{21213124211024} is an apocalyptic number.

It is an amenable number.

21213124211024 is a deficient number, since it is larger than the sum of its proper divisors (19887303947866).

21213124211024 is a wasteful number, since it uses less digits than its factorization.

21213124211024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325820263197 (or 1325820263191 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 21213124211024 its reverse (42011242131212), we get a palindrome (63224366342236).

It can be divided in two parts, 2121312 and 4211024, that added together give a palindrome (6332336).

The spelling of 21213124211024 in words is "twenty-one trillion, two hundred thirteen billion, one hundred twenty-four million, two hundred eleven thousand, twenty-four".