201210202111021 has 4 divisors (see below), whose sum is σ = 203202382330044. Its totient is φ = 199218021892000.

The previous prime is 201210202111003. The next prime is 201210202111043. The reversal of 201210202111021 is 120111202012102.

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 193794547262121 + 7415654848900 = 13921011^2 + 2723170^2 .

It is a cyclic number.

It is not a de Polignac number, because 201210202111021 - 2¹¹ = 201210202108973 is a prime.

It is a super-3 number, since 3×201210202111021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201210202110986 and 201210202111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210272111021) 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, 996090109360 + ... + 996090109561.

It is an arithmetic number, because the mean of its divisors is an integer number (50800595582511).

Almost surely, 2^{201210202111021} is an apocalyptic number.

It is an amenable number.

201210202111021 is a deficient number, since it is larger than the sum of its proper divisors (1992180219023).

201210202111021 is a wasteful number, since it uses less digits than its factorization.

201210202111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992180219022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201210202111021 its reverse (120111202012102), we get a palindrome (321321404123123).

The spelling of 201210202111021 in words is "two hundred one trillion, two hundred ten billion, two hundred two million, one hundred eleven thousand, twenty-one".