29921997955 has 8 divisors (see below), whose sum is σ = 35908945632. Its totient is φ = 23935899648.

The previous prime is 29921997929. The next prime is 29921997967. The reversal of 29921997955 is 55979912992.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 29921997955 - 2¹⁷ = 29921866883 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132079 + ... + 278008.

It is an arithmetic number, because the mean of its divisors is an integer number (4488618204).

Almost surely, 2^29921997955 is an apocalyptic number.

29921997955 is a deficient number, since it is larger than the sum of its proper divisors (5986947677).

29921997955 is a wasteful number, since it uses less digits than its factorization.

29921997955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424685.

The product of its digits is 41334300, while the sum is 67.

The spelling of 29921997955 in words is "twenty-nine billion, nine hundred twenty-one million, nine hundred ninety-seven thousand, nine hundred fifty-five".