20120101019 has 4 divisors (see below), whose sum is σ = 20215457160. Its totient is φ = 20024744880.

The previous prime is 20120100953. The next prime is 20120101031. The reversal of 20120101019 is 91010102102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91010102102 = 2 ⋅45505051051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120101019 is a prime.

It is a super-2 number, since 2×20120101019² (a number of 21 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 = 20120100988 and 20120101006.

It is not an unprimeable number, because it can be changed into a prime (20120191019) 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, 47677754 + ... + 47678175.

It is an arithmetic number, because the mean of its divisors is an integer number (5053864290).

Almost surely, 2^20120101019 is an apocalyptic number.

20120101019 is a deficient number, since it is larger than the sum of its proper divisors (95356141).

20120101019 is an equidigital number, since it uses as much as digits as its factorization.

20120101019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95356140.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20120101019 in words is "twenty billion, one hundred twenty million, one hundred one thousand, nineteen".