221221200426 has 16 divisors (see below), whose sum is σ = 461679027264. Its totient is φ = 70534295744.

The previous prime is 221221200401. The next prime is 221221200427. The reversal of 221221200426 is 624002122122.

It is a junction number, because it is equal to n+sod(n) for n = 221221200396 and 221221200405.

It is not an unprimeable number, because it can be changed into a prime (221221200427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 801525951 + ... + 801526226.

It is an arithmetic number, because the mean of its divisors is an integer number (28854939204).

Almost surely, 2^221221200426 is an apocalyptic number.

221221200426 is an abundant number, since it is smaller than the sum of its proper divisors (240457826838).

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

221221200426 is a wasteful number, since it uses less digits than its factorization.

221221200426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603052205.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 221221200426 its reverse (624002122122), we get a palindrome (845223322548).

The spelling of 221221200426 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, four hundred twenty-six".