20200121221221 has 16 divisors (see below), whose sum is σ = 29927185080000. Its totient is φ = 13466261675664.

The previous prime is 20200121221193. The next prime is 20200121221283. The reversal of 20200121221221 is 12212212100202.

It is a happy number.

20200121221221 is a `hidden beast` number, since 2 + 0 + 200 + 1 + 21 + 221 + 221 = 666.

It is not a de Polignac number, because 20200121221221 - 2¹⁵ = 20200121188453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20200121221194 and 20200121221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200111221221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12731491 + ... + 14229936.

It is an arithmetic number, because the mean of its divisors is an integer number (1870449067500).

Almost surely, 2^{20200121221221} is an apocalyptic number.

It is an amenable number.

20200121221221 is a deficient number, since it is larger than the sum of its proper divisors (9727063858779).

20200121221221 is a wasteful number, since it uses less digits than its factorization.

20200121221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26989185 (or 26989179 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20200121221221 its reverse (12212212100202), we get a palindrome (32412333321423).

The spelling of 20200121221221 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".