29891421 has 48 divisors (see below), whose sum is σ = 52665600. Its totient is φ = 16299360.

The previous prime is 29891399. The next prime is 29891437. The reversal of 29891421 is 12419892.

It is not a de Polignac number, because 29891421 - 2⁶ = 29891357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29891441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70791 + ... + 71211.

It is an arithmetic number, because the mean of its divisors is an integer number (1097200).

Almost surely, 2^29891421 is an apocalyptic number.

29891421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

29891421 is a deficient number, since it is larger than the sum of its proper divisors (22774179).

29891421 is a wasteful number, since it uses less digits than its factorization.

29891421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 454 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 29891421 is about 5467.3047290233. The cubic root of 29891421 is about 310.3479305450.

It can be divided in two parts, 298 and 91421, that added together give a palindrome (91719).

The spelling of 29891421 in words is "twenty-nine million, eight hundred ninety-one thousand, four hundred twenty-one".