20312121330 has 160 divisors (see below), whose sum is σ = 57845867904. Its totient is φ = 5103419904.

The previous prime is 20312121293. The next prime is 20312121341. The reversal of 20312121330 is 3312121302.

20312121330 is a `hidden beast` number, since 2 + 0 + 312 + 1 + 21 + 330 = 666.

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 79 ways as a sum of consecutive naturals, for example, 1240074 + ... + 1256346.

Almost surely, 2^20312121330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20312121330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28922933952).

20312121330 is an abundant number, since it is smaller than the sum of its proper divisors (37533746574).

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

20312121330 is a wasteful number, since it uses less digits than its factorization.

20312121330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16382 (or 16373 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20312121330 its reverse (3312121302), we get a palindrome (23624242632).

The spelling of 20312121330 in words is "twenty billion, three hundred twelve million, one hundred twenty-one thousand, three hundred thirty".