20101202211997 has 2 divisors, whose sum is σ = 20101202211998. Its totient is φ = 20101202211996.

The previous prime is 20101202211991. The next prime is 20101202212033. The reversal of 20101202211997 is 79911220210102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12191417207641 + 7909785004356 = 3491621^2 + 2812434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101202211997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101202211991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050601105998 + 10050601105999.

It is an arithmetic number, because the mean of its divisors is an integer number (10050601105999).

Almost surely, 2^{20101202211997} is an apocalyptic number.

It is an amenable number.

20101202211997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101202211997 is an equidigital number, since it uses as much as digits as its factorization.

20101202211997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 20101202211997 in words is "twenty trillion, one hundred one billion, two hundred two million, two hundred eleven thousand, nine hundred ninety-seven".