21120020019 has 48 divisors (see below), whose sum is σ = 37321939200. Its totient is φ = 11239570368.

The previous prime is 21120019961. The next prime is 21120020029. The reversal of 21120020019 is 91002002112.

It is not a de Polignac number, because 21120020019 - 2⁸ = 21120019763 is a prime.

It is a super-2 number, since 2×21120020019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21120019983 and 21120020010.

It is not an unprimeable number, because it can be changed into a prime (21120020029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78904 + ... + 220149.

It is an arithmetic number, because the mean of its divisors is an integer number (777540400).

Almost surely, 2^21120020019 is an apocalyptic number.

21120020019 is a deficient number, since it is larger than the sum of its proper divisors (16201919181).

21120020019 is a wasteful number, since it uses less digits than its factorization.

21120020019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299144 (or 299141 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 21120020019 in words is "twenty-one billion, one hundred twenty million, twenty thousand, nineteen".