221020000021220 has 24 divisors (see below), whose sum is σ = 464212527900408. Its totient is φ = 88394566131200.

The previous prime is 221020000021189. The next prime is 221020000021241. The reversal of 221020000021220 is 22120000020122.

It can be written as a sum of positive squares in 4 ways, for example, as 1213222943296 + 219806777077924 = 1101464^2 + 14825882^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221020000021195 and 221020000021204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 839482421 + ... + 839745660.

It is an arithmetic number, because the mean of its divisors is an integer number (19342188662517).

Almost surely, 2^{221020000021220} is an apocalyptic number.

221020000021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020000021220 is an abundant number, since it is smaller than the sum of its proper divisors (243192527879188).

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

221020000021220 is a wasteful number, since it uses less digits than its factorization.

221020000021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679234671 (or 1679234669 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221020000021220 its reverse (22120000020122), we get a palindrome (243140000041342).

The spelling of 221020000021220 in words is "two hundred twenty-one trillion, twenty billion, twenty-one thousand, two hundred twenty".