202021200112121 has 16 divisors (see below), whose sum is σ = 218111863814544. Its totient is φ = 186009200492544.

The previous prime is 202021200112091. The next prime is 202021200112129. The reversal of 202021200112121 is 121211002120202.

It can be written as a sum of positive squares in 8 ways, for example, as 433339141225 + 201587860970896 = 658285^2 + 14198164^2 .

It is a de Polignac number, because none of the positive numbers 2^k-202021200112121 is a prime.

It is a super-2 number, since 2×202021200112121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202021200112121.

It is not an unprimeable number, because it can be changed into a prime (202021200112129) 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, 583809665 + ... + 584155601.

It is an arithmetic number, because the mean of its divisors is an integer number (13631991488409).

Almost surely, 2^{202021200112121} is an apocalyptic number.

It is an amenable number.

202021200112121 is a deficient number, since it is larger than the sum of its proper divisors (16090663702423).

202021200112121 is a wasteful number, since it uses less digits than its factorization.

202021200112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459500.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202021200112121 its reverse (121211002120202), we get a palindrome (323232202232323).

The spelling of 202021200112121 in words is "two hundred two trillion, twenty-one billion, two hundred million, one hundred twelve thousand, one hundred twenty-one".