21102020100019 has 2 divisors, whose sum is σ = 21102020100020. Its totient is φ = 21102020100018.

The previous prime is 21102020099807. The next prime is 21102020100023. The reversal of 21102020100019 is 91000102020112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102020100019 - 2¹³ = 21102020091827 is a prime.

It is a super-2 number, since 2×21102020100019² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102020099969 and 21102020100005.

It is not a weakly prime, because it can be changed into another prime (21102020100059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551010050009 + 10551010050010.

It is an arithmetic number, because the mean of its divisors is an integer number (10551010050010).

Almost surely, 2^{21102020100019} is an apocalyptic number.

21102020100019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102020100019 is an equidigital number, since it uses as much as digits as its factorization.

21102020100019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21102020100019 in words is "twenty-one trillion, one hundred two billion, twenty million, one hundred thousand, nineteen".