20000202021221 has 4 divisors (see below), whose sum is σ = 20018500468812. Its totient is φ = 19981903573632.

The previous prime is 20000202021209. The next prime is 20000202021269. The reversal of 20000202021221 is 12212020200002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14367359584900 + 5632842436321 = 3790430^2 + 2373361^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000202021221 - 2¹⁴ = 20000202004837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000202021196 and 20000202021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000202021271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9149222156 + ... + 9149224341.

It is an arithmetic number, because the mean of its divisors is an integer number (5004625117203).

Almost surely, 2^{20000202021221} is an apocalyptic number.

It is an amenable number.

20000202021221 is a deficient number, since it is larger than the sum of its proper divisors (18298447591).

20000202021221 is a wasteful number, since it uses less digits than its factorization.

20000202021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18298447590.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20000202021221 its reverse (12212020200002), we get a palindrome (32212222221223).

The spelling of 20000202021221 in words is "twenty trillion, two hundred two million, twenty-one thousand, two hundred twenty-one".