202121022121201 has 4 divisors (see below), whose sum is σ = 203289351729012. Its totient is φ = 200952692513392.

The previous prime is 202121022121133. The next prime is 202121022121219. The reversal of 202121022121201 is 102121220121202.

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 82698089634801 + 119422932486400 = 9093849^2 + 10928080^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121022121201 - 2⁴¹ = 199921998865649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202121022121301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584164803646 + ... + 584164803991.

It is an arithmetic number, because the mean of its divisors is an integer number (50822337932253).

Almost surely, 2^{202121022121201} is an apocalyptic number.

It is an amenable number.

202121022121201 is a deficient number, since it is larger than the sum of its proper divisors (1168329607811).

202121022121201 is a wasteful number, since it uses less digits than its factorization.

202121022121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168329607810.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202121022121201 its reverse (102121220121202), we get a palindrome (304242242242403).

The spelling of 202121022121201 in words is "two hundred two trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty-one thousand, two hundred one".