201123129988 has 18 divisors (see below), whose sum is σ = 386871145598. Its totient is φ = 91419604320.

The previous prime is 201123129973. The next prime is 201123129989. The reversal of 201123129988 is 889921321102.

It can be written as a sum of positive squares in only one way, i.e., 198685930564 + 2437199424 = 445742^2 + 49368^2 .

It is not an unprimeable number, because it can be changed into a prime (201123129989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207771345 + ... + 207772312.

Almost surely, 2^201123129988 is an apocalyptic number.

It is an amenable number.

201123129988 is a deficient number, since it is larger than the sum of its proper divisors (185748015610).

201123129988 is a wasteful number, since it uses less digits than its factorization.

201123129988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415543683 (or 415543670 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 201123129988 in words is "two hundred one billion, one hundred twenty-three million, one hundred twenty-nine thousand, nine hundred eighty-eight".