201021121021123 has 16 divisors (see below), whose sum is σ = 221169380181120. Its totient is φ = 181544984413056.

The previous prime is 201021121021013. The next prime is 201021121021139. The reversal of 201021121021123 is 321120121120102.

It is a cyclic number.

It is not a de Polignac number, because 201021121021123 - 2¹³ = 201021121012931 is a prime.

It is a super-2 number, since 2×201021121021123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201021121021123.

It is not an unprimeable number, because it can be changed into a prime (201021121021153) 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, 57104668 + ... + 60522601.

It is an arithmetic number, because the mean of its divisors is an integer number (13823086261320).

Almost surely, 2^{201021121021123} is an apocalyptic number.

201021121021123 is a deficient number, since it is larger than the sum of its proper divisors (20148259159997).

201021121021123 is a wasteful number, since it uses less digits than its factorization.

201021121021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117630126.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 201021121021123 its reverse (321120121120102), we get a palindrome (522141242141225).

The spelling of 201021121021123 in words is "two hundred one trillion, twenty-one billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-three".