20121340134 has 32 divisors (see below), whose sum is σ = 46091013120. Its totient is φ = 5736532032.

The previous prime is 20121340133. The next prime is 20121340163. The reversal of 20121340134 is 43104312102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20121340134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121340133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497919 + ... + 536810.

It is an arithmetic number, because the mean of its divisors is an integer number (1440344160).

Almost surely, 2^20121340134 is an apocalyptic number.

20121340134 is an abundant number, since it is smaller than the sum of its proper divisors (25969672986).

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

20121340134 is a wasteful number, since it uses less digits than its factorization.

20121340134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035204.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20121340134 its reverse (43104312102), we get a palindrome (63225652236).

The spelling of 20121340134 in words is "twenty billion, one hundred twenty-one million, three hundred forty thousand, one hundred thirty-four".