200102121 has 24 divisors (see below), whose sum is σ = 306810504. Its totient is φ = 125237760.

The previous prime is 200102113. The next prime is 200102153. The reversal of 200102121 is 121201002.

It can be written as a sum of positive squares in 4 ways, for example, as 4410000 + 195692121 = 2100^2 + 13989^2 .

It is not a de Polignac number, because 200102121 - 2³ = 200102113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (200102101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69115 + ... + 71951.

It is an arithmetic number, because the mean of its divisors is an integer number (12783771).

Almost surely, 2^200102121 is an apocalyptic number.

It is an amenable number.

200102121 is a deficient number, since it is larger than the sum of its proper divisors (106708383).

200102121 is a wasteful number, since it uses less digits than its factorization.

200102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321 (or 3318 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 200102121 is about 14145.7456855409. The cubic root of 200102121 is about 584.9030652449.

Adding to 200102121 its reverse (121201002), we get a palindrome (321303123).

The spelling of 200102121 in words is "two hundred million, one hundred two thousand, one hundred twenty-one".