21212012019 has 8 divisors (see below), whose sum is σ = 30853835712. Its totient is φ = 12855764840.

The previous prime is 21212011969. The next prime is 21212012023. The reversal of 21212012019 is 91021021212.

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 21212012019 - 2¹⁷ = 21211880947 is a prime.

It is a super-2 number, since 2×21212012019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212011986 and 21212012004.

It is not an unprimeable number, because it can be changed into a prime (21212012069) 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, 321394089 + ... + 321394154.

It is an arithmetic number, because the mean of its divisors is an integer number (3856729464).

Almost surely, 2^21212012019 is an apocalyptic number.

21212012019 is a deficient number, since it is larger than the sum of its proper divisors (9641823693).

21212012019 is a wasteful number, since it uses less digits than its factorization.

21212012019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642788257.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21212012019 in words is "twenty-one billion, two hundred twelve million, twelve thousand, nineteen".