221871852 has 24 divisors (see below), whose sum is σ = 575223600. Its totient is φ = 73957248.

The previous prime is 221871847. The next prime is 221871857. The reversal of 221871852 is 258178122.

It is an interprime number because it is at equal distance from previous prime (221871847) and next prime (221871857).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (221871857) 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, 1027077 + ... + 1027292.

It is an arithmetic number, because the mean of its divisors is an integer number (23967650).

Almost surely, 2^221871852 is an apocalyptic number.

It is an amenable number.

221871852 is an abundant number, since it is smaller than the sum of its proper divisors (353351748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221871852 is a wasteful number, since it uses less digits than its factorization.

221871852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054382 (or 2054374 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 221871852 is about 14895.3634396748. The cubic root of 221871852 is about 605.3883643564.

The spelling of 221871852 in words is "two hundred twenty-one million, eight hundred seventy-one thousand, eight hundred fifty-two".