29902221 has 12 divisors (see below), whose sum is σ = 43243200. Its totient is φ = 19911240.

The previous prime is 29902193. The next prime is 29902247. The reversal of 29902221 is 12220992.

It is not a de Polignac number, because 29902221 - 2⁵ = 29902189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29902421) 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, 9730 + ... + 12428.

It is an arithmetic number, because the mean of its divisors is an integer number (3603600).

Almost surely, 2^29902221 is an apocalyptic number.

It is an amenable number.

29902221 is a deficient number, since it is larger than the sum of its proper divisors (13340979).

29902221 is a wasteful number, since it uses less digits than its factorization.

29902221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936 (or 3933 counting only the distinct ones).

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

The square root of 29902221 is about 5468.2923294206. The cubic root of 29902221 is about 310.3853030747.

The spelling of 29902221 in words is "twenty-nine million, nine hundred two thousand, two hundred twenty-one".