200021020121 has 8 divisors (see below), whose sum is σ = 215413888704. Its totient is φ = 184629099600.

The previous prime is 200021020091. The next prime is 200021020123. The reversal of 200021020121 is 121020120002.

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 200021020121 - 2¹⁸ = 200020757977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200021020123) 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, 236180 + ... + 675146.

It is an arithmetic number, because the mean of its divisors is an integer number (26926736088).

Almost surely, 2^200021020121 is an apocalyptic number.

It is an amenable number.

200021020121 is a deficient number, since it is larger than the sum of its proper divisors (15392868583).

200021020121 is a wasteful number, since it uses less digits than its factorization.

200021020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474031.

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

Adding to 200021020121 its reverse (121020120002), we get a palindrome (321041140123).

The spelling of 200021020121 in words is "two hundred billion, twenty-one million, twenty thousand, one hundred twenty-one".