201123232156 has 96 divisors (see below), whose sum is σ = 444665313792. Its totient is φ = 77321072640.

The previous prime is 201123232129. The next prime is 201123232157. The reversal of 201123232156 is 651232321102.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201123232157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7887780 + ... + 7913236.

It is an arithmetic number, because the mean of its divisors is an integer number (4631930352).

Almost surely, 2^201123232156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201123232156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222332656896).

201123232156 is an abundant number, since it is smaller than the sum of its proper divisors (243542081636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201123232156 is a wasteful number, since it uses less digits than its factorization.

201123232156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25819 (or 25817 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 201123232156 its reverse (651232321102), we get a palindrome (852355553258).

The spelling of 201123232156 in words is "two hundred one billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred fifty-six".