201000002121 has 32 divisors (see below), whose sum is σ = 311039139840. Its totient is φ = 128044184400.

The previous prime is 201000002051. The next prime is 201000002179. The reversal of 201000002121 is 121200000102.

It is not a de Polignac number, because 201000002121 - 2¹⁴ = 200999985737 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 (201000002221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 452106 + ... + 778716.

It is an arithmetic number, because the mean of its divisors is an integer number (9719973120).

Almost surely, 2^201000002121 is an apocalyptic number.

It is an amenable number.

201000002121 is a deficient number, since it is larger than the sum of its proper divisors (110039137719).

201000002121 is a wasteful number, since it uses less digits than its factorization.

201000002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327634 (or 327628 counting only the distinct ones).

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

Adding to 201000002121 its reverse (121200000102), we get a palindrome (322200002223).

The spelling of 201000002121 in words is "two hundred one billion, two thousand, one hundred twenty-one".