20121002122061 has 2 divisors, whose sum is σ = 20121002122062. Its totient is φ = 20121002122060.

The previous prime is 20121002122021. The next prime is 20121002122099. The reversal of 20121002122061 is 16022120012102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19892715015625 + 228287106436 = 4460125^2 + 477794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121002122061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121002122021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060501061030 + 10060501061031.

It is an arithmetic number, because the mean of its divisors is an integer number (10060501061031).

Almost surely, 2^{20121002122061} is an apocalyptic number.

It is an amenable number.

20121002122061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121002122061 is an equidigital number, since it uses as much as digits as its factorization.

20121002122061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 20121002122061 its reverse (16022120012102), we get a palindrome (36143122134163).

The spelling of 20121002122061 in words is "twenty trillion, one hundred twenty-one billion, two million, one hundred twenty-two thousand, sixty-one".