29997922687721 has 16 divisors (see below), whose sum is σ = 32201663212224. Its totient is φ = 27843074763264.

The previous prime is 29997922687717. The next prime is 29997922687763. The reversal of 29997922687721 is 12778622979992.

It is a cyclic number.

It is not a de Polignac number, because 29997922687721 - 2² = 29997922687717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29997922687771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8364290 + ... + 11399876.

It is an arithmetic number, because the mean of its divisors is an integer number (2012603950764).

Almost surely, 2^{29997922687721} is an apocalyptic number.

It is an amenable number.

29997922687721 is a deficient number, since it is larger than the sum of its proper divisors (2203740524503).

29997922687721 is a wasteful number, since it uses less digits than its factorization.

29997922687721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043640.

The product of its digits is 1728324864, while the sum is 80.

The spelling of 29997922687721 in words is "twenty-nine trillion, nine hundred ninety-seven billion, nine hundred twenty-two million, six hundred eighty-seven thousand, seven hundred twenty-one".