20121312030 has 128 divisors (see below), whose sum is σ = 52075187712. Its totient is φ = 4957421568.

The previous prime is 20121312023. The next prime is 20121312053. The reversal of 20121312030 is 3021312102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11856142 + ... + 11857838.

It is an arithmetic number, because the mean of its divisors is an integer number (406837404).

Almost surely, 2^20121312030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121312030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26037593856).

20121312030 is an abundant number, since it is smaller than the sum of its proper divisors (31953875682).

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

20121312030 is a wasteful number, since it uses less digits than its factorization.

20121312030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20121312030 its product of nonzero digits (72), we get a palindrome (20121312102).

Adding to 20121312030 its reverse (3021312102), we get a palindrome (23142624132).

The spelling of 20121312030 in words is "twenty billion, one hundred twenty-one million, three hundred twelve thousand, thirty".