202011102220021 has 16 divisors (see below), whose sum is σ = 205561876448944. Its totient is φ = 198481813254144.

The previous prime is 202011102220007. The next prime is 202011102220049. The reversal of 202011102220021 is 120022201110202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 39274160948100 + 162736941271921 = 6266910^2 + 12756839^2 .

It is a cyclic number.

It is not a de Polignac number, because 202011102220021 - 2⁷ = 202011102219893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202011102219977 and 202011102220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202011102280021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93096601 + ... + 95241793.

It is an arithmetic number, because the mean of its divisors is an integer number (12847617278059).

Almost surely, 2^{202011102220021} is an apocalyptic number.

It is an amenable number.

202011102220021 is a deficient number, since it is larger than the sum of its proper divisors (3550774228923).

202011102220021 is a wasteful number, since it uses less digits than its factorization.

202011102220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150200.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202011102220021 its reverse (120022201110202), we get a palindrome (322033303330223).

The spelling of 202011102220021 in words is "two hundred two trillion, eleven billion, one hundred two million, two hundred twenty thousand, twenty-one".