202142220232121 has 4 divisors (see below), whose sum is σ = 217691621788452. Its totient is φ = 186592818675792.

The previous prime is 202142220232103. The next prime is 202142220232151. The reversal of 202142220232121 is 121232022241202.

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 81998458090000 + 120143762142121 = 9055300^2 + 10961011^2 .

It is a cyclic number.

It is not a de Polignac number, because 202142220232121 - 2⁴⁶ = 131773476054457 is a prime.

It is a super-2 number, since 2×202142220232121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202142220232151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7774700778146 + ... + 7774700778171.

It is an arithmetic number, because the mean of its divisors is an integer number (54422905447113).

Almost surely, 2^{202142220232121} is an apocalyptic number.

It is an amenable number.

202142220232121 is a deficient number, since it is larger than the sum of its proper divisors (15549401556331).

202142220232121 is a wasteful number, since it uses less digits than its factorization.

202142220232121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15549401556330.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 202142220232121 its reverse (121232022241202), we get a palindrome (323374242473323).

The spelling of 202142220232121 in words is "two hundred two trillion, one hundred forty-two billion, two hundred twenty million, two hundred thirty-two thousand, one hundred twenty-one".