201862121 has 4 divisors (see below), whose sum is σ = 207317892. Its totient is φ = 196406352.

The previous prime is 201862117. The next prime is 201862123. The reversal of 201862121 is 121268102.

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 189337600 + 12524521 = 13760^2 + 3539^2 .

It is a cyclic number.

It is not a de Polignac number, because 201862121 - 2² = 201862117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201862123) 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, 2727830 + ... + 2727903.

It is an arithmetic number, because the mean of its divisors is an integer number (51829473).

Almost surely, 2^201862121 is an apocalyptic number.

It is an amenable number.

201862121 is a deficient number, since it is larger than the sum of its proper divisors (5455771).

201862121 is an equidigital number, since it uses as much as digits as its factorization.

201862121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455770.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 201862121 is about 14207.8190092639. The cubic root of 201862121 is about 586.6129020906.

The spelling of 201862121 in words is "two hundred one million, eight hundred sixty-two thousand, one hundred twenty-one".