221121221020220 has 12 divisors (see below), whose sum is σ = 464354564142504. Its totient is φ = 88448488408080.

The previous prime is 221121221020181. The next prime is 221121221020307. The reversal of 221121221020220 is 22020122121122.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 11056061051011 = 221121221020220 / (2 + 2 + 1 + 1 + 2 + 1 + 2 + 2 + 1 + 0 + 2 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 221121221020192 and 221121221020201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5528030525486 + ... + 5528030525525.

It is an arithmetic number, because the mean of its divisors is an integer number (38696213678542).

Almost surely, 2^{221121221020220} is an apocalyptic number.

221121221020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121221020220 is an abundant number, since it is smaller than the sum of its proper divisors (243233343122284).

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

221121221020220 is a wasteful number, since it uses less digits than its factorization.

221121221020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11056061051020 (or 11056061051018 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221121221020220 its reverse (22020122121122), we get a palindrome (243141343141342).

The spelling of 221121221020220 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, two hundred twenty".