29921471 has 4 divisors (see below), whose sum is σ = 30055872. Its totient is φ = 29787072.

The previous prime is 29921467. The next prime is 29921473. The reversal of 29921471 is 17412992.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 29921471 - 2² = 29921467 is a prime.

It is a super-3 number, since 3×29921471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29921473) 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 3 ways as a sum of consecutive naturals, for example, 66866 + ... + 67311.

It is an arithmetic number, because the mean of its divisors is an integer number (7513968).

Almost surely, 2^29921471 is an apocalyptic number.

29921471 is a deficient number, since it is larger than the sum of its proper divisors (134401).

29921471 is a wasteful number, since it uses less digits than its factorization.

29921471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134400.

The product of its digits is 9072, while the sum is 35.

The square root of 29921471 is about 5470.0521935353. The cubic root of 29921471 is about 310.4518938406.

The spelling of 29921471 in words is "twenty-nine million, nine hundred twenty-one thousand, four hundred seventy-one".