20121420342 has 16 divisors (see below), whose sum is σ = 40244621760. Its totient is φ = 6706843272.

The previous prime is 20121420323. The next prime is 20121420353. The reversal of 20121420342 is 24302412102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106509 + ... + 227127.

It is an arithmetic number, because the mean of its divisors is an integer number (2515288860).

Almost surely, 2^20121420342 is an apocalyptic number.

20121420342 is an abundant number, since it is smaller than the sum of its proper divisors (20123201418).

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

20121420342 is a wasteful number, since it uses less digits than its factorization.

20121420342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148427.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20121420342 its reverse (24302412102), we get a palindrome (44423832444).

The spelling of 20121420342 in words is "twenty billion, one hundred twenty-one million, four hundred twenty thousand, three hundred forty-two".