29904021 has 12 divisors (see below), whose sum is σ = 49365472. Its totient is φ = 17087976.

The previous prime is 29904019. The next prime is 29904023. The reversal of 29904021 is 12040992.

It is an interprime number because it is at equal distance from previous prime (29904019) and next prime (29904023).

It is not a de Polignac number, because 29904021 - 2¹ = 29904019 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 (29904023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237271 + ... + 237396.

Almost surely, 2^29904021 is an apocalyptic number.

29904021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

29904021 is a deficient number, since it is larger than the sum of its proper divisors (19461451).

29904021 is a wasteful number, since it uses less digits than its factorization.

29904021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474680 (or 474677 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 29904021 is about 5468.4569121462. The cubic root of 29904021 is about 310.3915309547.

The spelling of 29904021 in words is "twenty-nine million, nine hundred four thousand, twenty-one".