221020002122120 has 16 divisors (see below), whose sum is σ = 497295004774860. Its totient is φ = 88408000848832.

The previous prime is 221020002122077. The next prime is 221020002122177. The reversal of 221020002122120 is 21221200020122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 220468389919684 + 551612202436 = 14848178^2 + 742706^2 .

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, 2762750026487 + ... + 2762750026566.

Almost surely, 2^{221020002122120} is an apocalyptic number.

221020002122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020002122120 is an abundant number, since it is smaller than the sum of its proper divisors (276275002652740).

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

221020002122120 is a wasteful number, since it uses less digits than its factorization.

221020002122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5525500053064 (or 5525500053060 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221020002122120 its reverse (21221200020122), we get a palindrome (242241202142242).

The spelling of 221020002122120 in words is "two hundred twenty-one trillion, twenty billion, two million, one hundred twenty-two thousand, one hundred twenty".