221401063650 has 96 divisors (see below), whose sum is σ = 593067541248. Its totient is φ = 54336844800.

The previous prime is 221401063649. The next prime is 221401063657. The reversal of 221401063650 is 56360104122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (221401063657) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 488695 + ... + 825605.

It is an arithmetic number, because the mean of its divisors is an integer number (6177786888).

Almost surely, 2^221401063650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221401063650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296533770624).

221401063650 is an abundant number, since it is smaller than the sum of its proper divisors (371666477598).

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

221401063650 is a wasteful number, since it uses less digits than its factorization.

221401063650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337276 (or 337271 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 221401063650 its reverse (56360104122), we get a palindrome (277761167772).

The spelling of 221401063650 in words is "two hundred twenty-one billion, four hundred one million, sixty-three thousand, six hundred fifty".