29181493421 has 4 divisors (see below), whose sum is σ = 29360521152. Its totient is φ = 29002465692.

The previous prime is 29181493417. The next prime is 29181493477. The reversal of 29181493421 is 12439418192.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 29181493421 - 2² = 29181493417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29181493721) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 89513621 + ... + 89513946.

It is an arithmetic number, because the mean of its divisors is an integer number (7340130288).

Almost surely, 2^29181493421 is an apocalyptic number.

It is an amenable number.

29181493421 is a deficient number, since it is larger than the sum of its proper divisors (179027731).

29181493421 is a wasteful number, since it uses less digits than its factorization.

29181493421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179027730.

The product of its digits is 124416, while the sum is 44.

The spelling of 29181493421 in words is "twenty-nine billion, one hundred eighty-one million, four hundred ninety-three thousand, four hundred twenty-one".