21001120202159 has 2 divisors, whose sum is σ = 21001120202160. Its totient is φ = 21001120202158.

The previous prime is 21001120202009. The next prime is 21001120202171. The reversal of 21001120202159 is 95120202110012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001120202159 is a prime.

It is a super-2 number, since 2×21001120202159² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001120232159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500560101079 + 10500560101080.

It is an arithmetic number, because the mean of its divisors is an integer number (10500560101080).

Almost surely, 2^{21001120202159} is an apocalyptic number.

21001120202159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001120202159 is an equidigital number, since it uses as much as digits as its factorization.

21001120202159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 21001120202159 in words is "twenty-one trillion, one billion, one hundred twenty million, two hundred two thousand, one hundred fifty-nine".