20101002201997 has 2 divisors, whose sum is σ = 20101002201998. Its totient is φ = 20101002201996.

The previous prime is 20101002201991. The next prime is 20101002202067. The reversal of 20101002201997 is 79910220010102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18153445190596 + 1947557011401 = 4260686^2 + 1395549^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101002201997 - 2³ = 20101002201989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101002201991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050501100998 + 10050501100999.

It is an arithmetic number, because the mean of its divisors is an integer number (10050501100999).

Almost surely, 2^{20101002201997} is an apocalyptic number.

It is an amenable number.

20101002201997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101002201997 is an equidigital number, since it uses as much as digits as its factorization.

20101002201997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 20101002201997 in words is "twenty trillion, one hundred one billion, two million, two hundred one thousand, nine hundred ninety-seven".