20123121132 has 36 divisors (see below), whose sum is σ = 50901492096. Its totient is φ = 6703129440.

The previous prime is 20123121127. The next prime is 20123121149. The reversal of 20123121132 is 23112132102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20123121132² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137043 + ... + 242954.

It is an arithmetic number, because the mean of its divisors is an integer number (1413930336).

Almost surely, 2^20123121132 is an apocalyptic number.

It is an amenable number.

20123121132 is an abundant number, since it is smaller than the sum of its proper divisors (30778370964).

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

20123121132 is a wasteful number, since it uses less digits than its factorization.

20123121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381478 (or 381473 counting only the distinct ones).

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

Adding to 20123121132 its reverse (23112132102), we get a palindrome (43235253234).

The spelling of 20123121132 in words is "twenty billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred thirty-two".