221021134 has 8 divisors (see below), whose sum is σ = 342226368. Its totient is φ = 106945680.

The previous prime is 221021111. The next prime is 221021137. The reversal of 221021134 is 431120122.

221021134 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021137) 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, 1782367 + ... + 1782490.

It is an arithmetic number, because the mean of its divisors is an integer number (42778296).

Almost surely, 2^221021134 is an apocalyptic number.

221021134 is a deficient number, since it is larger than the sum of its proper divisors (121205234).

221021134 is a wasteful number, since it uses less digits than its factorization.

221021134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564890.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221021134 is about 14866.7795436671. The cubic root of 221021134 is about 604.6136312301.

Adding to 221021134 its reverse (431120122), we get a palindrome (652141256).

The spelling of 221021134 in words is "two hundred twenty-one million, twenty-one thousand, one hundred thirty-four".