21535734476 has 6 divisors (see below), whose sum is σ = 37687535340. Its totient is φ = 10767867236.

The previous prime is 21535734461. The next prime is 21535734481. The reversal of 21535734476 is 67443753512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21535734476.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691966806 + ... + 2691966813.

It is an arithmetic number, because the mean of its divisors is an integer number (6281255890).

Almost surely, 2^21535734476 is an apocalyptic number.

It is an amenable number.

21535734476 is a deficient number, since it is larger than the sum of its proper divisors (16151800864).

21535734476 is a wasteful number, since it uses less digits than its factorization.

21535734476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5383933623 (or 5383933621 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 47.

The spelling of 21535734476 in words is "twenty-one billion, five hundred thirty-five million, seven hundred thirty-four thousand, four hundred seventy-six".