29721212968 has 8 divisors (see below), whose sum is σ = 55727274330. Its totient is φ = 14860606480.

The previous prime is 29721212947. The next prime is 29721212993. The reversal of 29721212968 is 86921212792.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27310206564 + 2411006404 = 165258^2 + 49102^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×29721212968² (a number of 22 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, 1857575803 + ... + 1857575818.

Almost surely, 2^29721212968 is an apocalyptic number.

It is an amenable number.

29721212968 is a deficient number, since it is larger than the sum of its proper divisors (26006061362).

29721212968 is a wasteful number, since it uses less digits than its factorization.

29721212968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3715151627 (or 3715151623 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The spelling of 29721212968 in words is "twenty-nine billion, seven hundred twenty-one million, two hundred twelve thousand, nine hundred sixty-eight".