221011503156 has 120 divisors (see below), whose sum is σ = 594676938240. Its totient is φ = 71545032000.

The previous prime is 221011503143. The next prime is 221011503211. The reversal of 221011503156 is 651305110122.

221011503156 is a `hidden beast` number, since 2 + 2 + 1 + 0 + 1 + 1 + 503 + 156 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1490581 + ... + 1632131.

It is an arithmetic number, because the mean of its divisors is an integer number (4955641152).

Almost surely, 2^221011503156 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 221011503156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297338469120).

221011503156 is an abundant number, since it is smaller than the sum of its proper divisors (373665435084).

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

221011503156 is a wasteful number, since it uses less digits than its factorization.

221011503156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141707 (or 141696 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 221011503156 its reverse (651305110122), we get a palindrome (872316613278).

The spelling of 221011503156 in words is "two hundred twenty-one billion, eleven million, five hundred three thousand, one hundred fifty-six".