1021200101 has 2 divisors, whose sum is σ = 1021200102. Its totient is φ = 1021200100.

The previous prime is 1021200031. The next prime is 1021200107. The reversal of 1021200101 is 1010021201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784840225 + 236359876 = 28015^2 + 15374^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021200101 - 2¹⁰ = 1021199077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021200107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510600050 + 510600051.

It is an arithmetic number, because the mean of its divisors is an integer number (510600051).

Almost surely, 2^1021200101 is an apocalyptic number.

It is an amenable number.

1021200101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021200101 is an equidigital number, since it uses as much as digits as its factorization.

1021200101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1021200101 is about 31956.2216321016. The cubic root of 1021200101 is about 1007.0173420586.

Adding to 1021200101 its reverse (1010021201), we get a palindrome (2031221302).

The spelling of 1021200101 in words is "one billion, twenty-one million, two hundred thousand, one hundred one".