221003211404420 has 24 divisors (see below), whose sum is σ = 464650831609944. Its totient is φ = 88297648816896.

The previous prime is 221003211404389. The next prime is 221003211404429. The reversal of 221003211404420 is 24404112300122.

It can be written as a sum of positive squares in 4 ways, for example, as 8113109115904 + 212890102288516 = 2848352^2 + 14590754^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221003211404420.

It is not an unprimeable number, because it can be changed into a prime (221003211404429) 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, 6477216569 + ... + 6477250688.

It is an arithmetic number, because the mean of its divisors is an integer number (19360451317081).

Almost surely, 2^{221003211404420} is an apocalyptic number.

221003211404420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221003211404420 is an abundant number, since it is smaller than the sum of its proper divisors (243647620205524).

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

221003211404420 is a wasteful number, since it uses less digits than its factorization.

221003211404420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12954468119 (or 12954468117 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 221003211404420 its reverse (24404112300122), we get a palindrome (245407323704542).

The spelling of 221003211404420 in words is "two hundred twenty-one trillion, three billion, two hundred eleven million, four hundred four thousand, four hundred twenty".