20121442427 has 2 divisors, whose sum is σ = 20121442428. Its totient is φ = 20121442426.

The previous prime is 20121442417. The next prime is 20121442433. The reversal of 20121442427 is 72424412102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121442427 - 2¹⁴ = 20121426043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121442427.

It is not a weakly prime, because it can be changed into another prime (20121442417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060721213 + 10060721214.

It is an arithmetic number, because the mean of its divisors is an integer number (10060721214).

Almost surely, 2^20121442427 is an apocalyptic number.

20121442427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121442427 is an equidigital number, since it uses as much as digits as its factorization.

20121442427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 29.

Adding to 20121442427 its reverse (72424412102), we get a palindrome (92545854529).

The spelling of 20121442427 in words is "twenty billion, one hundred twenty-one million, four hundred forty-two thousand, four hundred twenty-seven".