21351506477382 has 12 divisors (see below), whose sum is σ = 46261597367700. Its totient is φ = 7117168825788.

The previous prime is 21351506477359. The next prime is 21351506477407. The reversal of 21351506477382 is 28377460515312.

21351506477382 is a `hidden beast` number, since 2 + 1 + 3 + 51 + 506 + 4 + 7 + 7 + 3 + 82 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 593097402132 + ... + 593097402167.

It is an arithmetic number, because the mean of its divisors is an integer number (3855133113975).

Almost surely, 2^{21351506477382} is an apocalyptic number.

21351506477382 is an abundant number, since it is smaller than the sum of its proper divisors (24910090890318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21351506477382 is a wasteful number, since it uses less digits than its factorization.

21351506477382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186194804307 (or 1186194804304 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 21351506477382 in words is "twenty-one trillion, three hundred fifty-one billion, five hundred six million, four hundred seventy-seven thousand, three hundred eighty-two".