201021221000121 has 16 divisors (see below), whose sum is σ = 275067076901760. Its totient is φ = 130537415502720.

The previous prime is 201021221000069. The next prime is 201021221000137. The reversal of 201021221000121 is 121000122120102.

It is not a de Polignac number, because 201021221000121 - 2⁴² = 196623174489017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201021221000121.

It is not an unprimeable number, because it can be changed into a prime (201021221000161) 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, 5332391916 + ... + 5332429613.

It is an arithmetic number, because the mean of its divisors is an integer number (17191692306360).

Almost surely, 2^{201021221000121} is an apocalyptic number.

It is an amenable number.

201021221000121 is a deficient number, since it is larger than the sum of its proper divisors (74045855901639).

201021221000121 is a wasteful number, since it uses less digits than its factorization.

201021221000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10664821696.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201021221000121 its reverse (121000122120102), we get a palindrome (322021343120223).

The spelling of 201021221000121 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.