200121011211021 has 16 divisors (see below), whose sum is σ = 271863822159936. Its totient is φ = 130896128245376.

The previous prime is 200121011210969. The next prime is 200121011211047. The reversal of 200121011211021 is 120112110121002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 200121011211021 - 2³⁹ = 199571255397133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121011211061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31092721 + ... + 36972953.

It is an arithmetic number, because the mean of its divisors is an integer number (16991488884996).

Almost surely, 2^{200121011211021} is an apocalyptic number.

It is an amenable number.

200121011211021 is a deficient number, since it is larger than the sum of its proper divisors (71742810948915).

200121011211021 is a wasteful number, since it uses less digits than its factorization.

200121011211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6094332.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 200121011211021 its reverse (120112110121002), we get a palindrome (320233121332023).

The spelling of 200121011211021 in words is "two hundred trillion, one hundred twenty-one billion, eleven million, two hundred eleven thousand, twenty-one".