2145515222101 has 2 divisors, whose sum is σ = 2145515222102. Its totient is φ = 2145515222100.

The previous prime is 2145515222099. The next prime is 2145515222117. The reversal of 2145515222101 is 1012225155412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2003385468100 + 142129754001 = 1415410^2 + 377001^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145515222101 - 2¹ = 2145515222099 is a prime.

Together with 2145515222099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145515222131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072757611050 + 1072757611051.

It is an arithmetic number, because the mean of its divisors is an integer number (1072757611051).

Almost surely, 2^{2145515222101} is an apocalyptic number.

It is an amenable number.

2145515222101 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145515222101 is an equidigital number, since it uses as much as digits as its factorization.

2145515222101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 31.

The spelling of 2145515222101 in words is "two trillion, one hundred forty-five billion, five hundred fifteen million, two hundred twenty-two thousand, one hundred one".