200121101220021 has 16 divisors (see below), whose sum is σ = 273336566858880. Its totient is φ = 130159861735680.

The previous prime is 200121101220011. The next prime is 200121101220023. The reversal of 200121101220021 is 120022101121002.

It is not a de Polignac number, because 200121101220021 - 2⁹ = 200121101219509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121101220023) 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, 154536801 + ... + 155826393.

It is an arithmetic number, because the mean of its divisors is an integer number (17083535428680).

Almost surely, 2^{200121101220021} is an apocalyptic number.

It is an amenable number.

200121101220021 is a deficient number, since it is larger than the sum of its proper divisors (73215465638859).

200121101220021 is a wasteful number, since it uses less digits than its factorization.

200121101220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551276.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 200121101220021 its reverse (120022101121002), we get a palindrome (320143202341023).

The spelling of 200121101220021 in words is "two hundred trillion, one hundred twenty-one billion, one hundred one million, two hundred twenty thousand, twenty-one".