29518421 has 4 divisors (see below), whose sum is σ = 29533644. Its totient is φ = 29503200.

The previous prime is 29518351. The next prime is 29518427. The reversal of 29518421 is 12481592.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20124196 + 9394225 = 4486^2 + 3065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29518421 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 (29518427) 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, 4190 + ... + 8751.

It is an arithmetic number, because the mean of its divisors is an integer number (7383411).

Almost surely, 2^29518421 is an apocalyptic number.

It is an amenable number.

29518421 is a deficient number, since it is larger than the sum of its proper divisors (15223).

29518421 is a wasteful number, since it uses less digits than its factorization.

29518421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15222.

The product of its digits is 5760, while the sum is 32.

The square root of 29518421 is about 5433.0857714562. The cubic root of 29518421 is about 309.0516316637.

The spelling of 29518421 in words is "twenty-nine million, five hundred eighteen thousand, four hundred twenty-one".