201002121 has 16 divisors (see below), whose sum is σ = 313454400. Its totient is φ = 126948384.

The previous prime is 201002111. The next prime is 201002141. The reversal of 201002121 is 121200102.

It is not a de Polignac number, because 201002121 - 2⁶ = 201002057 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (201002111) 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, 195396 + ... + 196421.

It is an arithmetic number, because the mean of its divisors is an integer number (19590900).

Almost surely, 2^201002121 is an apocalyptic number.

It is an amenable number.

201002121 is a deficient number, since it is larger than the sum of its proper divisors (112452279).

201002121 is a wasteful number, since it uses less digits than its factorization.

201002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391845 (or 391839 counting only the distinct ones).

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

The square root of 201002121 is about 14177.5216804631. The cubic root of 201002121 is about 585.7786606760.

Adding to 201002121 its reverse (121200102), we get a palindrome (322202223).

The spelling of 201002121 in words is "two hundred one million, two thousand, one hundred twenty-one".