200121120021021 has 4 divisors (see below), whose sum is σ = 266828160028032. Its totient is φ = 133414080014012.

The previous prime is 200121120021013. The next prime is 200121120021029. The reversal of 200121120021021 is 120120021121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (200121120021013) and next prime (200121120021029).

It is a cyclic number.

It is not a de Polignac number, because 200121120021021 - 2³ = 200121120021013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121120021029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33353520003501 + ... + 33353520003506.

It is an arithmetic number, because the mean of its divisors is an integer number (66707040007008).

Almost surely, 2^{200121120021021} is an apocalyptic number.

It is an amenable number.

200121120021021 is a deficient number, since it is larger than the sum of its proper divisors (66707040007011).

200121120021021 is an equidigital number, since it uses as much as digits as its factorization.

200121120021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66707040007010.

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

Adding to 200121120021021 its reverse (120120021121002), we get a palindrome (320241141142023).

The spelling of 200121120021021 in words is "two hundred trillion, one hundred twenty-one billion, one hundred twenty million, twenty-one thousand, twenty-one".