221982929 has 4 divisors (see below), whose sum is σ = 253694784. Its totient is φ = 190271076.

The previous prime is 221982883. The next prime is 221982967. The reversal of 221982929 is 929289122.

221982929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221982929 - 2¹⁶ = 221917393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221982929.

It is not an unprimeable number, because it can be changed into a prime (221982329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15855917 + ... + 15855930.

It is an arithmetic number, because the mean of its divisors is an integer number (63423696).

Almost surely, 2^221982929 is an apocalyptic number.

It is an amenable number.

221982929 is a deficient number, since it is larger than the sum of its proper divisors (31711855).

221982929 is an equidigital number, since it uses as much as digits as its factorization.

221982929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31711854.

The product of its digits is 93312, while the sum is 44.

The square root of 221982929 is about 14899.0915494872. The cubic root of 221982929 is about 605.4893738718.

The spelling of 221982929 in words is "two hundred twenty-one million, nine hundred eighty-two thousand, nine hundred twenty-nine".