200121221101601 has 2 divisors, whose sum is σ = 200121221101602. Its totient is φ = 200121221101600.

The previous prime is 200121221101597. The next prime is 200121221101651. The reversal of 200121221101601 is 106101122121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184240988131600 + 15880232970001 = 13573540^2 + 3985001^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121221101601 - 2² = 200121221101597 is a prime.

It is not a weakly prime, because it can be changed into another prime (200121221101651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060610550800 + 100060610550801.

It is an arithmetic number, because the mean of its divisors is an integer number (100060610550801).

Almost surely, 2^{200121221101601} is an apocalyptic number.

It is an amenable number.

200121221101601 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121221101601 is an equidigital number, since it uses as much as digits as its factorization.

200121221101601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 200121221101601 its reverse (106101122121002), we get a palindrome (306222343222603).

The spelling of 200121221101601 in words is "two hundred trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, six hundred one".