29990121438 has 32 divisors (see below), whose sum is σ = 60122880000. Its totient is φ = 9972961056.

The previous prime is 29990121409. The next prime is 29990121439. The reversal of 29990121438 is 83412109992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29990121439) 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, 7350283 + ... + 7354361.

It is an arithmetic number, because the mean of its divisors is an integer number (1878840000).

Almost surely, 2^29990121438 is an apocalyptic number.

29990121438 is an abundant number, since it is smaller than the sum of its proper divisors (30132758562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29990121438 is a wasteful number, since it uses less digits than its factorization.

29990121438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6696.

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 29990121438 in words is "twenty-nine billion, nine hundred ninety million, one hundred twenty-one thousand, four hundred thirty-eight".