20121320042 has 8 divisors (see below), whose sum is σ = 30182735136. Its totient is φ = 10060408332.

The previous prime is 20121320029. The next prime is 20121320059. The reversal of 20121320042 is 24002312102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20121320042.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238 + ... + 200609.

It is an arithmetic number, because the mean of its divisors is an integer number (3772841892).

Almost surely, 2^20121320042 is an apocalyptic number.

20121320042 is a deficient number, since it is larger than the sum of its proper divisors (10061415094).

20121320042 is a wasteful number, since it uses less digits than its factorization.

20121320042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251692.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20121320042 its reverse (24002312102), we get a palindrome (44123632144).

The spelling of 20121320042 in words is "twenty billion, one hundred twenty-one million, three hundred twenty thousand, forty-two".