20121344430 has 64 divisors (see below), whose sum is σ = 52701062400. Its totient is φ = 4876075520.

The previous prime is 20121344429. The next prime is 20121344461. The reversal of 20121344430 is 3444312102.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121344430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1009501 + ... + 1029239.

It is an arithmetic number, because the mean of its divisors is an integer number (823454100).

Almost surely, 2^20121344430 is an apocalyptic number.

20121344430 is an abundant number, since it is smaller than the sum of its proper divisors (32579717970).

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

20121344430 is a wasteful number, since it uses less digits than its factorization.

20121344430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22849.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20121344430 its reverse (3444312102), we get a palindrome (23565656532).

The spelling of 20121344430 in words is "twenty billion, one hundred twenty-one million, three hundred forty-four thousand, four hundred thirty".