20121010121287 has 2 divisors, whose sum is σ = 20121010121288. Its totient is φ = 20121010121286.

The previous prime is 20121010121143. The next prime is 20121010121309. The reversal of 20121010121287 is 78212101012102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121010121287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121010121687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060505060643 + 10060505060644.

It is an arithmetic number, because the mean of its divisors is an integer number (10060505060644).

Almost surely, 2^{20121010121287} is an apocalyptic number.

20121010121287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121010121287 is an equidigital number, since it uses as much as digits as its factorization.

20121010121287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

Adding to 20121010121287 its reverse (78212101012102), we get a palindrome (98333111133389).

The spelling of 20121010121287 in words is "twenty trillion, one hundred twenty-one billion, ten million, one hundred twenty-one thousand, two hundred eighty-seven".