202011212021 has 4 divisors (see below), whose sum is σ = 204778488972. Its totient is φ = 199243935072.

The previous prime is 202011212017. The next prime is 202011212047. The reversal of 202011212021 is 120212110202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120212110202 = 2 ⋅60106055101.

It can be written as a sum of positive squares in 2 ways, for example, as 122437008100 + 79574203921 = 349910^2 + 282089^2 .

It is a cyclic number.

It is not a de Polignac number, because 202011212021 - 2² = 202011212017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202011211987 and 202011212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202011242021) 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, 1383638366 + ... + 1383638511.

It is an arithmetic number, because the mean of its divisors is an integer number (51194622243).

Almost surely, 2^202011212021 is an apocalyptic number.

It is an amenable number.

202011212021 is a deficient number, since it is larger than the sum of its proper divisors (2767276951).

202011212021 is an equidigital number, since it uses as much as digits as its factorization.

202011212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2767276950.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202011212021 its reverse (120212110202), we get a palindrome (322223322223).

The spelling of 202011212021 in words is "two hundred two billion, eleven million, two hundred twelve thousand, twenty-one".