20012211001220 has 24 divisors (see below), whose sum is σ = 42025778495064. Its totient is φ = 8004858611456.

The previous prime is 20012211001219. The next prime is 20012211001291. The reversal of 20012211001220 is 2210011221002.

It can be written as a sum of positive squares in 4 ways, for example, as 853801872196 + 19158409129024 = 924014^2 + 4377032^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20012211001195 and 20012211001204.

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, 5521304 + ... + 8396976.

It is an arithmetic number, because the mean of its divisors is an integer number (1751074103961).

Almost surely, 2^{20012211001220} is an apocalyptic number.

20012211001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012211001220 is an abundant number, since it is smaller than the sum of its proper divisors (22013567493844).

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

20012211001220 is a wasteful number, since it uses less digits than its factorization.

20012211001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223639 (or 3223637 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20012211001220 its reverse (2210011221002), we get a palindrome (22222222222222).

The spelling of 20012211001220 in words is "twenty trillion, twelve billion, two hundred eleven million, one thousand, two hundred twenty".