2100021210019 has 4 divisors (see below), whose sum is σ = 2100497517720. Its totient is φ = 2099544902320.

The previous prime is 2100021209971. The next prime is 2100021210061. The reversal of 2100021210019 is 9100121200012.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100021210019 is a prime.

It is a super-2 number, since 2×2100021210019² (a number of 25 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 = 2100021209978 and 2100021210005.

It is not an unprimeable number, because it can be changed into a prime (2100021210719) 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, 238147237 + ... + 238156054.

It is an arithmetic number, because the mean of its divisors is an integer number (525124379430).

Almost surely, 2^{2100021210019} is an apocalyptic number.

2100021210019 is a deficient number, since it is larger than the sum of its proper divisors (476307701).

2100021210019 is an equidigital number, since it uses as much as digits as its factorization.

2100021210019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476307700.

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

The spelling of 2100021210019 in words is "two trillion, one hundred billion, twenty-one million, two hundred ten thousand, nineteen".