201121002011021 has 4 divisors (see below), whose sum is σ = 201121826984352. Its totient is φ = 201120177037692.

The previous prime is 201121002010993. The next prime is 201121002011029. The reversal of 201121002011021 is 120110200121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201121002011021 - 2¹⁴ = 201121001994637 is a prime.

It is a super-2 number, since 2×201121002011021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121002010987 and 201121002011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121002011029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412120871 + ... + 412608596.

It is an arithmetic number, because the mean of its divisors is an integer number (50280456746088).

Almost surely, 2^{201121002011021} is an apocalyptic number.

It is an amenable number.

201121002011021 is a deficient number, since it is larger than the sum of its proper divisors (824973331).

201121002011021 is an equidigital number, since it uses as much as digits as its factorization.

201121002011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824973330.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201121002011021 its reverse (120110200121102), we get a palindrome (321231202132123).

The spelling of 201121002011021 in words is "two hundred one trillion, one hundred twenty-one billion, two million, eleven thousand, twenty-one".