2102011021997 has 2 divisors, whose sum is σ = 2102011021998. Its totient is φ = 2102011021996.

The previous prime is 2102011021987. The next prime is 2102011022029. The reversal of 2102011021997 is 7991201102012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1829929857001 + 272081164996 = 1352749^2 + 521614^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102011021997 - 2²² = 2102006827693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102011021987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051005510998 + 1051005510999.

It is an arithmetic number, because the mean of its divisors is an integer number (1051005510999).

Almost surely, 2^{2102011021997} is an apocalyptic number.

It is an amenable number.

2102011021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102011021997 is an equidigital number, since it uses as much as digits as its factorization.

2102011021997 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 35.

The spelling of 2102011021997 in words is "two trillion, one hundred two billion, eleven million, twenty-one thousand, nine hundred ninety-seven".