21202110019 has 2 divisors, whose sum is σ = 21202110020. Its totient is φ = 21202110018.

The previous prime is 21202109959. The next prime is 21202110029. The reversal of 21202110019 is 91001120212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202110019 - 2⁷ = 21202109891 is a prime.

It is a super-2 number, since 2×21202110019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21202109978 and 21202110005.

It is not a weakly prime, because it can be changed into another prime (21202110029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601055009 + 10601055010.

It is an arithmetic number, because the mean of its divisors is an integer number (10601055010).

Almost surely, 2^21202110019 is an apocalyptic number.

21202110019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202110019 is an equidigital number, since it uses as much as digits as its factorization.

21202110019 is an evil number, because the sum of its binary digits is even.

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

The spelling of 21202110019 in words is "twenty-one billion, two hundred two million, one hundred ten thousand, nineteen".