221221429 has 16 divisors (see below), whose sum is σ = 271200384. Its totient is φ = 177566400.

The previous prime is 221221423. The next prime is 221221447. The reversal of 221221429 is 924122122.

It is not a de Polignac number, because 221221429 - 2³ = 221221421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30342 + ... + 36919.

It is an arithmetic number, because the mean of its divisors is an integer number (16950024).

Almost surely, 2^221221429 is an apocalyptic number.

It is an amenable number.

221221429 is a deficient number, since it is larger than the sum of its proper divisors (49978955).

221221429 is a wasteful number, since it uses less digits than its factorization.

221221429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67308.

The product of its digits is 1152, while the sum is 25.

The square root of 221221429 is about 14873.5143459776. The cubic root of 221221429 is about 604.7962148619.

The spelling of 221221429 in words is "two hundred twenty-one million, two hundred twenty-one thousand, four hundred twenty-nine".