221152071 has 16 divisors (see below), whose sum is σ = 346102784. Its totient is φ = 122956704.

The previous prime is 221152067. The next prime is 221152081. The reversal of 221152071 is 170251122.

221152071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221152071 - 2² = 221152067 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221152081) 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, 141535 + ... + 143088.

It is an arithmetic number, because the mean of its divisors is an integer number (21631424).

Almost surely, 2^221152071 is an apocalyptic number.

221152071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221152071 is a deficient number, since it is larger than the sum of its proper divisors (124950713).

221152071 is a wasteful number, since it uses less digits than its factorization.

221152071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284670.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 221152071 is about 14871.1825689822. The cubic root of 221152071 is about 604.7330024195.

The spelling of 221152071 in words is "two hundred twenty-one million, one hundred fifty-two thousand, seventy-one".