202011001021 has 4 divisors (see below), whose sum is σ = 204011110044. Its totient is φ = 200010892000.

The previous prime is 202011000991. The next prime is 202011001063. The reversal of 202011001021 is 120100110202.

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 86957752996 + 115053248025 = 294886^2 + 339195^2 .

It is a cyclic number.

It is not a de Polignac number, because 202011001021 - 2⁹ = 202011000509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202011000989 and 202011001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202011001121) 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, 1000054360 + ... + 1000054561.

It is an arithmetic number, because the mean of its divisors is an integer number (51002777511).

Almost surely, 2^202011001021 is an apocalyptic number.

It is an amenable number.

202011001021 is a deficient number, since it is larger than the sum of its proper divisors (2000109023).

202011001021 is a wasteful number, since it uses less digits than its factorization.

202011001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000109022.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 202011001021 its reverse (120100110202), we get a palindrome (322111111223).

The spelling of 202011001021 in words is "two hundred two billion, eleven million, one thousand, twenty-one".