20122000222221 has 6 divisors (see below), whose sum is σ = 29065111432110. Its totient is φ = 13414666814808.

The previous prime is 20122000222153. The next prime is 20122000222223. The reversal of 20122000222221 is 12222200022102.

20122000222221 is a `hidden beast` number, since 2 + 0 + 1 + 220 + 0 + 0 + 222 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18113416832196 + 2008583390025 = 4255986^2 + 1417245^2 .

It is not a de Polignac number, because 20122000222221 - 2²³ = 20121991833613 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20122000222194 and 20122000222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122000222223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117888901226 + ... + 1117888901243.

It is an arithmetic number, because the mean of its divisors is an integer number (4844185238685).

Almost surely, 2^{20122000222221} is an apocalyptic number.

It is an amenable number.

20122000222221 is a deficient number, since it is larger than the sum of its proper divisors (8943111209889).

20122000222221 is a wasteful number, since it uses less digits than its factorization.

20122000222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235777802475 (or 2235777802472 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20122000222221 its reverse (12222200022102), we get a palindrome (32344200244323).

The spelling of 20122000222221 in words is "twenty trillion, one hundred twenty-two billion, two hundred twenty-two thousand, two hundred twenty-one".