20000000202121 has 4 divisors (see below), whose sum is σ = 20001336311700. Its totient is φ = 19998664092544.

The previous prime is 20000000202097. The next prime is 20000000202137. The reversal of 20000000202121 is 12120200000002.

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 5426388550521 + 14573611651600 = 2329461^2 + 3817540^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000000202121 - 2²³ = 19999991813513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000000202098 and 20000000202107.

It is not an unprimeable number, because it can be changed into a prime (20000000202181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668032336 + ... + 668062273.

It is an arithmetic number, because the mean of its divisors is an integer number (5000334077925).

Almost surely, 2^{20000000202121} is an apocalyptic number.

It is an amenable number.

20000000202121 is a deficient number, since it is larger than the sum of its proper divisors (1336109579).

20000000202121 is a wasteful number, since it uses less digits than its factorization.

20000000202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336109578.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20000000202121 its reverse (12120200000002), we get a palindrome (32120200202123).

The spelling of 20000000202121 in words is "twenty trillion, two hundred two thousand, one hundred twenty-one".