201023121231 has 12 divisors (see below), whose sum is σ = 294700563352. Its totient is φ = 132015183696.

The previous prime is 201023121197. The next prime is 201023121259. The reversal of 201023121231 is 132121320102.

201023121231 is a `hidden beast` number, since 20 + 102 + 312 + 1 + 231 = 666.

It is not a de Polignac number, because 201023121231 - 2⁹ = 201023120719 is a prime.

It is a super-2 number, since 2×201023121231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201023121281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166685236 + ... + 166686441.

Almost surely, 2^201023121231 is an apocalyptic number.

201023121231 is a deficient number, since it is larger than the sum of its proper divisors (93677442121).

201023121231 is a wasteful number, since it uses less digits than its factorization.

201023121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333371750 (or 333371747 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 201023121231 its reverse (132121320102), we get a palindrome (333144441333).

The spelling of 201023121231 in words is "two hundred one billion, twenty-three million, one hundred twenty-one thousand, two hundred thirty-one".