1021121210201 has 4 divisors (see below), whose sum is σ = 1024917200100. Its totient is φ = 1017325220304.

The previous prime is 1021121210183. The next prime is 1021121210203. The reversal of 1021121210201 is 1020121211201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 627018504025 + 394102706176 = 791845^2 + 627776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021121210201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021121210203) 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, 1897994546 + ... + 1897995083.

It is an arithmetic number, because the mean of its divisors is an integer number (256229300025).

Almost surely, 2^{1021121210201} is an apocalyptic number.

It is an amenable number.

1021121210201 is a deficient number, since it is larger than the sum of its proper divisors (3795989899).

1021121210201 is an equidigital number, since it uses as much as digits as its factorization.

1021121210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3795989898.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021121210201 its reverse (1020121211201), we get a palindrome (2041242421402).

The spelling of 1021121210201 in words is "one trillion, twenty-one billion, one hundred twenty-one million, two hundred ten thousand, two hundred one".