201342121 has 4 divisors (see below), whose sum is σ = 201860100. Its totient is φ = 200824144.

The previous prime is 201342079. The next prime is 201342131. The reversal of 201342121 is 121243102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121243102 = 2 ⋅60621551.

It can be written as a sum of positive squares in 2 ways, for example, as 46090521 + 155251600 = 6789^2 + 12460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201342121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201342095 and 201342104.

It is not an unprimeable number, because it can be changed into a prime (201342131) 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, 258406 + ... + 259183.

It is an arithmetic number, because the mean of its divisors is an integer number (50465025).

Almost surely, 2^201342121 is an apocalyptic number.

It is an amenable number.

201342121 is a deficient number, since it is larger than the sum of its proper divisors (517979).

201342121 is an equidigital number, since it uses as much as digits as its factorization.

201342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517978.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 201342121 is about 14189.5074262640. The cubic root of 201342121 is about 586.1087609285.

Adding to 201342121 its reverse (121243102), we get a palindrome (322585223).

The spelling of 201342121 in words is "two hundred one million, three hundred forty-two thousand, one hundred twenty-one".