29272921 has 2 divisors, whose sum is σ = 29272922. Its totient is φ = 29272920.

The previous prime is 29272913. The next prime is 29272933. The reversal of 29272921 is 12927292.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18619225 + 10653696 = 4315^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 29272921 - 2³ = 29272913 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is equal to p_1815478 and since 29272921 and 1815478 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (29272421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14636460 + 14636461.

It is an arithmetic number, because the mean of its divisors is an integer number (14636461).

Almost surely, 2^29272921 is an apocalyptic number.

It is an amenable number.

29272921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29272921 is an equidigital number, since it uses as much as digits as its factorization.

29272921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 29272921 is about 5410.4455454241. The cubic root of 29272921 is about 308.1924676884.

The spelling of 29272921 in words is "twenty-nine million, two hundred seventy-two thousand, nine hundred twenty-one".