202155706021 has 4 divisors (see below), whose sum is σ = 202159846252. Its totient is φ = 202151565792.

The previous prime is 202155706013. The next prime is 202155706033. The reversal of 202155706021 is 120607551202.

202155706021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 176862302500 + 25293403521 = 420550^2 + 159039^2 .

It is a cyclic number.

It is not a de Polignac number, because 202155706021 - 2³ = 202155706013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202155703021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1995990 + ... + 2094823.

It is an arithmetic number, because the mean of its divisors is an integer number (50539961563).

Almost surely, 2^202155706021 is an apocalyptic number.

It is an amenable number.

202155706021 is a deficient number, since it is larger than the sum of its proper divisors (4140231).

202155706021 is an equidigital number, since it uses as much as digits as its factorization.

202155706021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140230.

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 202155706021 in words is "two hundred two billion, one hundred fifty-five million, seven hundred six thousand, twenty-one".