202120202101 has 4 divisors (see below), whose sum is σ = 214009625772. Its totient is φ = 190230778432.

The previous prime is 202120202099. The next prime is 202120202111. The reversal of 202120202101 is 101202021202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101202021202 = 2 ⋅50601010601.

It can be written as a sum of positive squares in 2 ways, for example, as 158345101476 + 43775100625 = 397926^2 + 209225^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120202101 - 2¹ = 202120202099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120202111) 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, 5944711810 + ... + 5944711843.

It is an arithmetic number, because the mean of its divisors is an integer number (53502406443).

Almost surely, 2^202120202101 is an apocalyptic number.

It is an amenable number.

202120202101 is a deficient number, since it is larger than the sum of its proper divisors (11889423671).

202120202101 is a wasteful number, since it uses less digits than its factorization.

202120202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11889423670.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202120202101 its reverse (101202021202), we get a palindrome (303322223303).

The spelling of 202120202101 in words is "two hundred two billion, one hundred twenty million, two hundred two thousand, one hundred one".