20121000312220 has 24 divisors (see below), whose sum is σ = 44739635989104. Its totient is φ = 7574964823296.

The previous prime is 20121000312211. The next prime is 20121000312221. The reversal of 20121000312220 is 2221300012102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20121000312194 and 20121000312203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121000312221) 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, 29589706002 + ... + 29589706681.

It is an arithmetic number, because the mean of its divisors is an integer number (1864151499546).

Almost surely, 2^{20121000312220} is an apocalyptic number.

20121000312220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121000312220 is an abundant number, since it is smaller than the sum of its proper divisors (24618635676884).

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

20121000312220 is a wasteful number, since it uses less digits than its factorization.

20121000312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59179412709 (or 59179412707 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121000312220 its reverse (2221300012102), we get a palindrome (22342300324322).

The spelling of 20121000312220 in words is "twenty trillion, one hundred twenty-one billion, three hundred twelve thousand, two hundred twenty".