21124153352404 has 12 divisors (see below), whose sum is σ = 36967613739700. Its totient is φ = 10561977998208.

The previous prime is 21124153352389. The next prime is 21124153352453. The reversal of 21124153352404 is 40425335142112.

It can be written as a sum of positive squares in 2 ways, for example, as 2379929460804 + 18744223891600 = 1542702^2 + 4329460^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24186789 + ... + 25044940.

Almost surely, 2^{21124153352404} is an apocalyptic number.

It is an amenable number.

21124153352404 is a deficient number, since it is larger than the sum of its proper divisors (15843460387296).

21124153352404 is a wasteful number, since it uses less digits than its factorization.

21124153352404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49339002 (or 49339000 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 21124153352404 its reverse (40425335142112), we get a palindrome (61549488494516).

The spelling of 21124153352404 in words is "twenty-one trillion, one hundred twenty-four billion, one hundred fifty-three million, three hundred fifty-two thousand, four hundred four".