221645246331450 has 48 divisors (see below), whose sum is σ = 549682539914016. Its totient is φ = 59105148590400.

The previous prime is 221645246331409. The next prime is 221645246331491. The reversal of 221645246331450 is 54133642546122.

It is an interprime number because it is at equal distance from previous prime (221645246331409) and next prime (221645246331491).

It is a self number, because there is not a number n which added to its sum of digits gives 221645246331450.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33840385 + ... + 39855515.

It is an arithmetic number, because the mean of its divisors is an integer number (11451719581542).

Almost surely, 2^{221645246331450} is an apocalyptic number.

221645246331450 is an abundant number, since it is smaller than the sum of its proper divisors (328037293582566).

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

221645246331450 is a wasteful number, since it uses less digits than its factorization.

221645246331450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6260799 (or 6260794 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 48.

Adding to 221645246331450 its reverse (54133642546122), we get a palindrome (275778888877572).

The spelling of 221645246331450 in words is "two hundred twenty-one trillion, six hundred forty-five billion, two hundred forty-six million, three hundred thirty-one thousand, four hundred fifty".