201542121 has 16 divisors (see below), whose sum is σ = 325725120. Its totient is φ = 122146560.

The previous prime is 201542069. The next prime is 201542137. The reversal of 201542121 is 121245102.

201542121 is a `hidden beast` number, since 2 + 0 + 1 + 542 + 121 = 666.

It is not a de Polignac number, because 201542121 - 2⁷ = 201541993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201542094 and 201542103.

It is not an unprimeable number, because it can be changed into a prime (201542221) 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, 339000 + ... + 339593.

It is an arithmetic number, because the mean of its divisors is an integer number (20357820).

Almost surely, 2^201542121 is an apocalyptic number.

It is an amenable number.

201542121 is a deficient number, since it is larger than the sum of its proper divisors (124182999).

201542121 is a wasteful number, since it uses less digits than its factorization.

201542121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678613 (or 678607 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 201542121 is about 14196.5531379980. The cubic root of 201542121 is about 586.3027639842.

Adding to 201542121 its reverse (121245102), we get a palindrome (322787223).

The spelling of 201542121 in words is "two hundred one million, five hundred forty-two thousand, one hundred twenty-one".