20012212021221 has 240 divisors, whose sum is σ = 36108823500288. Its totient is φ = 11001708748800.

The previous prime is 20012212021213. The next prime is 20012212021367. The reversal of 20012212021221 is 12212021221002.

It is a happy number.

20012212021221 is a `hidden beast` number, since 20 + 0 + 1 + 221 + 202 + 1 + 221 = 666.

It is not a de Polignac number, because 20012212021221 - 2³ = 20012212021213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012212021194 and 20012212021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012212021621) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 22715336701 + ... + 22715337581.

Almost surely, 2^{20012212021221} is an apocalyptic number.

20012212021221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20012212021221 is a deficient number, since it is larger than the sum of its proper divisors (16096611479067).

20012212021221 is a wasteful number, since it uses less digits than its factorization.

20012212021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814 (or 1798 counting only the distinct ones).

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

Adding to 20012212021221 its reverse (12212021221002), we get a palindrome (32224233242223).

The spelling of 20012212021221 in words is "twenty trillion, twelve billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".