200120100101021 has 2 divisors, whose sum is σ = 200120100101022. Its totient is φ = 200120100101020.

The previous prime is 200120100101017. The next prime is 200120100101081. The reversal of 200120100101021 is 120101001021002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139683702513796 + 60436397587225 = 11818786^2 + 7774085^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120100101021 - 2² = 200120100101017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200120100100993 and 200120100101011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200120100101081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060050050510 + 100060050050511.

It is an arithmetic number, because the mean of its divisors is an integer number (100060050050511).

Almost surely, 2^{200120100101021} is an apocalyptic number.

It is an amenable number.

200120100101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200120100101021 is an equidigital number, since it uses as much as digits as its factorization.

200120100101021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 200120100101021 its reverse (120101001021002), we get a palindrome (320221101122023).

The spelling of 200120100101021 in words is "two hundred trillion, one hundred twenty billion, one hundred million, one hundred one thousand, twenty-one".