21000000210019 has 4 divisors (see below), whose sum is σ = 21000742891344. Its totient is φ = 20999257528696.

The previous prime is 21000000210011. The next prime is 21000000210037. The reversal of 21000000210019 is 91001200000012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21000000210019 - 2³ = 21000000210011 is a prime.

It is a super-2 number, since 2×21000000210019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000000209984 and 21000000210011.

It is not an unprimeable number, because it can be changed into a prime (21000000210011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371298247 + ... + 371354800.

It is an arithmetic number, because the mean of its divisors is an integer number (5250185722836).

Almost surely, 2^{21000000210019} is an apocalyptic number.

21000000210019 is a deficient number, since it is larger than the sum of its proper divisors (742681325).

21000000210019 is an equidigital number, since it uses as much as digits as its factorization.

21000000210019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742681324.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 21000000210019 in words is "twenty-one trillion, two hundred ten thousand, nineteen".