20121021019 has 8 divisors (see below), whose sum is σ = 22707108720. Its totient is φ = 17661084000.

The previous prime is 20121021001. The next prime is 20121021031. The reversal of 20121021019 is 91012012102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121021019 - 2⁷ = 20121020891 is a prime.

It is a super-2 number, since 2×20121021019² (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 = 20121020987 and 20121021005.

It is not an unprimeable number, because it can be changed into a prime (20121021059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31537332 + ... + 31537969.

It is an arithmetic number, because the mean of its divisors is an integer number (2838388590).

Almost surely, 2^20121021019 is an apocalyptic number.

20121021019 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20121021019 is a deficient number, since it is larger than the sum of its proper divisors (2586087701).

20121021019 is a wasteful number, since it uses less digits than its factorization.

20121021019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63075341.

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

The spelling of 20121021019 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, nineteen".