221034156 has 48 divisors (see below), whose sum is σ = 593757696. Its totient is φ = 62688384.

The previous prime is 221034137. The next prime is 221034211. The reversal of 221034156 is 651430122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1905 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (12369952).

Almost surely, 2^221034156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221034156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296878848).

221034156 is an abundant number, since it is smaller than the sum of its proper divisors (372723540).

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

221034156 is a wasteful number, since it uses less digits than its factorization.

221034156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19358 (or 19356 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 221034156 is about 14867.2174935325. The cubic root of 221034156 is about 604.6255050932.

Adding to 221034156 its reverse (651430122), we get a palindrome (872464278).

The spelling of 221034156 in words is "two hundred twenty-one million, thirty-four thousand, one hundred fifty-six".