200121002021 has 8 divisors (see below), whose sum is σ = 201631671360. Its totient is φ = 198611346528.

The previous prime is 200121001907. The next prime is 200121002051. The reversal of 200121002021 is 120200121002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 200121002021 - 2¹⁸ = 200120739877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200121001993 and 200121002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121002051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145160 + ... + 649086.

It is an arithmetic number, because the mean of its divisors is an integer number (25203958920).

Almost surely, 2^200121002021 is an apocalyptic number.

It is an amenable number.

200121002021 is a deficient number, since it is larger than the sum of its proper divisors (1510669339).

200121002021 is a wasteful number, since it uses less digits than its factorization.

200121002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506923.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 200121002021 its reverse (120200121002), we get a palindrome (320321123023).

The spelling of 200121002021 in words is "two hundred billion, one hundred twenty-one million, two thousand, twenty-one".