29509396421 has 4 divisors (see below), whose sum is σ = 29513690592. Its totient is φ = 29505102252.

The previous prime is 29509396379. The next prime is 29509396471. The reversal of 29509396421 is 12469390592.

It is a happy number.

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 29509396421 - 2¹⁰ = 29509395397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29509396421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29509396471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136761 + ... + 2150526.

It is an arithmetic number, because the mean of its divisors is an integer number (7378422648).

Almost surely, 2^29509396421 is an apocalyptic number.

It is an amenable number.

29509396421 is a deficient number, since it is larger than the sum of its proper divisors (4294171).

29509396421 is an equidigital number, since it uses as much as digits as its factorization.

29509396421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4294170.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The spelling of 29509396421 in words is "twenty-nine billion, five hundred nine million, three hundred ninety-six thousand, four hundred twenty-one".