221421203572356 has 144 divisors (see below), whose sum is σ = 602909318968320. Its totient is φ = 68317214296320.

The previous prime is 221421203572343. The next prime is 221421203572421. The reversal of 221421203572356 is 653275302124122.

221421203572356 is a `hidden beast` number, since 2 + 2 + 1 + 4 + 2 + 1 + 20 + 3 + 572 + 3 + 56 = 666.

It is a super-2 number, since 2×221421203572356² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 526214706 + ... + 526635318.

Almost surely, 2^{221421203572356} 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 221421203572356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301454659484160).

221421203572356 is an abundant number, since it is smaller than the sum of its proper divisors (381488115395964).

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

221421203572356 is a wasteful number, since it uses less digits than its factorization.

221421203572356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441186 (or 441181 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

Adding to 221421203572356 its reverse (653275302124122), we get a palindrome (874696505696478).

The spelling of 221421203572356 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, five hundred seventy-two thousand, three hundred fifty-six".