21735939682 has 4 divisors (see below), whose sum is σ = 32603909526. Its totient is φ = 10867969840.

The previous prime is 21735939671. The next prime is 21735939707. The reversal of 21735939682 is 28693953712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20906557281 + 829382401 = 144591^2 + 28799^2 .

It is a super-2 number, since 2×21735939682² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5433984919 + ... + 5433984922.

Almost surely, 2^21735939682 is an apocalyptic number.

21735939682 is a deficient number, since it is larger than the sum of its proper divisors (10867969844).

21735939682 is a wasteful number, since it uses less digits than its factorization.

21735939682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10867969843.

The product of its digits is 4898880, while the sum is 55.

The spelling of 21735939682 in words is "twenty-one billion, seven hundred thirty-five million, nine hundred thirty-nine thousand, six hundred eighty-two".