29921 has 2 divisors, whose sum is σ = 29922. Its totient is φ = 29920.

The previous prime is 29917. The next prime is 29927. The reversal of 29921 is 12992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26896 + 3025 = 164^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 29921 - 2² = 29917 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 29921.

It is not a weakly prime, because it can be changed into another prime (29927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14960 + 14961.

It is an arithmetic number, because the mean of its divisors is an integer number (14961).

2²⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

29921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29921 is an equidigital number, since it uses as much as digits as its factorization.

29921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 29921 is about 172.9768770674. The cubic root of 29921 is about 31.0450264870.

The spelling of 29921 in words is "twenty-nine thousand, nine hundred twenty-one".