21040554131524 has 6 divisors (see below), whose sum is σ = 36820969730174. Its totient is φ = 10520277065760.

The previous prime is 21040554131507. The next prime is 21040554131539. The reversal of 21040554131524 is 42513145504012.

It can be written as a sum of positive squares in only one way, i.e., 10620311889924 + 10420242241600 = 3258882^2 + 3228040^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630069266437 + ... + 2630069266444.

Almost surely, 2^{21040554131524} is an apocalyptic number.

It is an amenable number.

21040554131524 is a deficient number, since it is larger than the sum of its proper divisors (15780415598650).

21040554131524 is a wasteful number, since it uses less digits than its factorization.

21040554131524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5260138532885 (or 5260138532883 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

Adding to 21040554131524 its reverse (42513145504012), we get a palindrome (63553699635536).

The spelling of 21040554131524 in words is "twenty-one trillion, forty billion, five hundred fifty-four million, one hundred thirty-one thousand, five hundred twenty-four".