221232650478 has 64 divisors (see below), whose sum is σ = 514564538880. Its totient is φ = 62107471872.

The previous prime is 221232650473. The next prime is 221232650489. The reversal of 221232650478 is 874056232122.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221232650473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 370950 + ... + 761622.

It is an arithmetic number, because the mean of its divisors is an integer number (8040070920).

Almost surely, 2^221232650478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221232650478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257282269440).

221232650478 is an abundant number, since it is smaller than the sum of its proper divisors (293331888402).

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

221232650478 is a wasteful number, since it uses less digits than its factorization.

221232650478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390921.

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 221232650478 in words is "two hundred twenty-one billion, two hundred thirty-two million, six hundred fifty thousand, four hundred seventy-eight".