29988117621 has 64 divisors (see below), whose sum is σ = 55421706240. Its totient is φ = 15569133120.

The previous prime is 29988117613. The next prime is 29988117631. The reversal of 29988117621 is 12671188992.

It is a happy number.

29988117621 is a `hidden beast` number, since 2 + 9 + 9 + 8 + 8 + 1 + 1 + 7 + 621 = 666.

It is not a de Polignac number, because 29988117621 - 2³ = 29988117613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29988117631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4951231 + ... + 4957283.

It is an arithmetic number, because the mean of its divisors is an integer number (865964160).

Almost surely, 2^29988117621 is an apocalyptic number.

29988117621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

29988117621 is a deficient number, since it is larger than the sum of its proper divisors (25433588619).

29988117621 is a wasteful number, since it uses less digits than its factorization.

29988117621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8463 (or 8457 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The spelling of 29988117621 in words is "twenty-nine billion, nine hundred eighty-eight million, one hundred seventeen thousand, six hundred twenty-one".