1021205201101 has 4 divisors (see below), whose sum is σ = 1021207222204. Its totient is φ = 1021203180000.

The previous prime is 1021205201099. The next prime is 1021205201123. The reversal of 1021205201101 is 1011025021201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 283315611076 + 737889590025 = 532274^2 + 859005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021205201101 - 2¹ = 1021205201099 is a prime.

It is a super-2 number, since 2×1021205201101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021205201161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501001 + ... + 1514401.

It is an arithmetic number, because the mean of its divisors is an integer number (255301805551).

Almost surely, 2^{1021205201101} is an apocalyptic number.

It is an amenable number.

1021205201101 is a deficient number, since it is larger than the sum of its proper divisors (2021103).

1021205201101 is a wasteful number, since it uses less digits than its factorization.

1021205201101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021102.

The product of its (nonzero) digits is 40, while the sum is 16.

The spelling of 1021205201101 in words is "one trillion, twenty-one billion, two hundred five million, two hundred one thousand, one hundred one".