20001220121022 has 16 divisors (see below), whose sum is σ = 45717074562432. Its totient is φ = 5714634320280.

The previous prime is 20001220121009. The next prime is 20001220121033. The reversal of 20001220121022 is 22012102210002.

It is a junction number, because it is equal to n+sod(n) for n = 20001220120992 and 20001220121010.

It is a congruent number.

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, 238109763304 + ... + 238109763387.

It is an arithmetic number, because the mean of its divisors is an integer number (2857317160152).

Almost surely, 2^{20001220121022} is an apocalyptic number.

20001220121022 is an abundant number, since it is smaller than the sum of its proper divisors (25715854441410).

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

20001220121022 is a wasteful number, since it uses less digits than its factorization.

20001220121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476219526703.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20001220121022 its reverse (22012102210002), we get a palindrome (42013322331024).

The spelling of 20001220121022 in words is "twenty trillion, one billion, two hundred twenty million, one hundred twenty-one thousand, twenty-two".