201021002121 has 16 divisors (see below), whose sum is σ = 268765922880. Its totient is φ = 133645317120.

The previous prime is 201021002107. The next prime is 201021002131. The reversal of 201021002121 is 121200120102.

It is not a de Polignac number, because 201021002121 - 2²⁷ = 200886784393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201021002097 and 201021002106.

It is not an unprimeable number, because it can be changed into a prime (201021002131) 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, 3005281 + ... + 3071441.

It is an arithmetic number, because the mean of its divisors is an integer number (16797870180).

Almost surely, 2^201021002121 is an apocalyptic number.

It is an amenable number.

201021002121 is a deficient number, since it is larger than the sum of its proper divisors (67744920759).

201021002121 is a wasteful number, since it uses less digits than its factorization.

201021002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68936.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201021002121 its reverse (121200120102), we get a palindrome (322221122223).

The spelling of 201021002121 in words is "two hundred one billion, twenty-one million, two thousand, one hundred twenty-one".