21153339682 has 4 divisors (see below), whose sum is σ = 31730009526. Its totient is φ = 10576669840.

The previous prime is 21153339661. The next prime is 21153339737. The reversal of 21153339682 is 28693335112.

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., 21120518241 + 32821441 = 145329^2 + 5729^2 .

It is a super-2 number, since 2×21153339682² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5288334919 + ... + 5288334922.

Almost surely, 2^21153339682 is an apocalyptic number.

21153339682 is a deficient number, since it is larger than the sum of its proper divisors (10576669844).

21153339682 is a wasteful number, since it uses less digits than its factorization.

21153339682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10576669843.

The product of its digits is 233280, while the sum is 43.

The spelling of 21153339682 in words is "twenty-one billion, one hundred fifty-three million, three hundred thirty-nine thousand, six hundred eighty-two".