20121020342 has 8 divisors (see below), whose sum is σ = 30184599432. Its totient is φ = 10059487200.

The previous prime is 20121020341. The next prime is 20121020347. The reversal of 20121020342 is 24302012102.

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 20121020342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121020341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486659 + ... + 526382.

It is an arithmetic number, because the mean of its divisors is an integer number (3773074929).

Almost surely, 2^20121020342 is an apocalyptic number.

20121020342 is a deficient number, since it is larger than the sum of its proper divisors (10063579090).

20121020342 is a wasteful number, since it uses less digits than its factorization.

20121020342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022974.

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

Adding to 20121020342 its reverse (24302012102), we get a palindrome (44423032444).

The spelling of 20121020342 in words is "twenty billion, one hundred twenty-one million, twenty thousand, three hundred forty-two".