20121201281 has 2 divisors, whose sum is σ = 20121201282. Its totient is φ = 20121201280.

The previous prime is 20121201263. The next prime is 20121201313. The reversal of 20121201281 is 18210212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17797961281 + 2323240000 = 133409^2 + 48200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121201281 is a prime.

It is a super-2 number, since 2×20121201281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20121201181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060600640 + 10060600641.

It is an arithmetic number, because the mean of its divisors is an integer number (10060600641).

Almost surely, 2^20121201281 is an apocalyptic number.

It is an amenable number.

20121201281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121201281 is an equidigital number, since it uses as much as digits as its factorization.

20121201281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20121201281 its reverse (18210212102), we get a palindrome (38331413383).

The spelling of 20121201281 in words is "twenty billion, one hundred twenty-one million, two hundred one thousand, two hundred eighty-one".