29420921 has 2 divisors, whose sum is σ = 29420922. Its totient is φ = 29420920.

The previous prime is 29420893. The next prime is 29420929. The reversal of 29420921 is 12902492.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29376400 + 44521 = 5420^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 29420921 - 2⁶ = 29420857 is a prime.

It is not a weakly prime, because it can be changed into another prime (29420929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14710460 + 14710461.

It is an arithmetic number, because the mean of its divisors is an integer number (14710461).

Almost surely, 2^29420921 is an apocalyptic number.

It is an amenable number.

29420921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29420921 is an equidigital number, since it uses as much as digits as its factorization.

29420921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 29420921 is about 5424.1055483831. The cubic root of 29420921 is about 308.7109882031.

The spelling of 29420921 in words is "twenty-nine million, four hundred twenty thousand, nine hundred twenty-one".