29861221 has 8 divisors (see below), whose sum is σ = 32906720. Its totient is φ = 26922672.

The previous prime is 29861203. The next prime is 29861281. The reversal of 29861221 is 12216892.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 29861221 - 2⁵ = 29861189 is a prime.

It is a super-2 number, since 2×29861221² = 1783385039221682, which contains 22 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 (29861281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26151 + ... + 27268.

It is an arithmetic number, because the mean of its divisors is an integer number (4113340).

Almost surely, 2^29861221 is an apocalyptic number.

It is an amenable number.

29861221 is a deficient number, since it is larger than the sum of its proper divisors (3045499).

29861221 is a wasteful number, since it uses less digits than its factorization.

29861221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53475.

The product of its digits is 3456, while the sum is 31.

The square root of 29861221 is about 5464.5421583148. The cubic root of 29861221 is about 310.2433780749.

The spelling of 29861221 in words is "twenty-nine million, eight hundred sixty-one thousand, two hundred twenty-one".