20212121101019 has 4 divisors (see below), whose sum is σ = 20218188988200. Its totient is φ = 20206053213840.

The previous prime is 20212121100967. The next prime is 20212121101061. The reversal of 20212121101019 is 91010112121202.

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-20212121101019 is a prime.

It is a super-2 number, since 2×20212121101019² (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 = 20212121100985 and 20212121101003.

It is not an unprimeable number, because it can be changed into a prime (20212121101069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3033938594 + ... + 3033945255.

It is an arithmetic number, because the mean of its divisors is an integer number (5054547247050).

Almost surely, 2^{20212121101019} is an apocalyptic number.

20212121101019 is a deficient number, since it is larger than the sum of its proper divisors (6067887181).

20212121101019 is an equidigital number, since it uses as much as digits as its factorization.

20212121101019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6067887180.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 20212121101019 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred one thousand, nineteen".