20121155713 has 2 divisors, whose sum is σ = 20121155714. Its totient is φ = 20121155712.

The previous prime is 20121155693. The next prime is 20121155741. The reversal of 20121155713 is 31755112102.

It is an a-pointer prime, because the next prime (20121155741) can be obtained adding 20121155713 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12111442704 + 8009713009 = 110052^2 + 89497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121155713 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121150713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060577856 + 10060577857.

It is an arithmetic number, because the mean of its divisors is an integer number (10060577857).

Almost surely, 2^20121155713 is an apocalyptic number.

It is an amenable number.

20121155713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121155713 is an equidigital number, since it uses as much as digits as its factorization.

20121155713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 28.

Adding to 20121155713 its reverse (31755112102), we get a palindrome (51876267815).

The spelling of 20121155713 in words is "twenty billion, one hundred twenty-one million, one hundred fifty-five thousand, seven hundred thirteen".