201044121021 has 6 divisors (see below), whose sum is σ = 290397063710. Its totient is φ = 134029414008.

The previous prime is 201044120987. The next prime is 201044121053. The reversal of 201044121021 is 120121440102.

201044121021 is a `hidden beast` number, since 2 + 0 + 10 + 441 + 210 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 168090980121 + 32953140900 = 409989^2 + 181530^2 .

It is not a de Polignac number, because 201044121021 - 2¹⁴ = 201044104637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201044120985 and 201044121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201044121221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11169117826 + ... + 11169117843.

Almost surely, 2^201044121021 is an apocalyptic number.

It is an amenable number.

201044121021 is a deficient number, since it is larger than the sum of its proper divisors (89352942689).

201044121021 is a wasteful number, since it uses less digits than its factorization.

201044121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22338235675 (or 22338235672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201044121021 its reverse (120121440102), we get a palindrome (321165561123).

The spelling of 201044121021 in words is "two hundred one billion, forty-four million, one hundred twenty-one thousand, twenty-one".