21212000019 has 48 divisors (see below), whose sum is σ = 37265012928. Its totient is φ = 11350112256.

The previous prime is 21211999979. The next prime is 21212000021. The reversal of 21212000019 is 91000021212.

It is not a de Polignac number, because 21212000019 - 2²¹ = 21209902867 is a prime.

It is a super-2 number, since 2×21212000019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211999965 and 21212000010.

It is not an unprimeable number, because it can be changed into a prime (21212000119) 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, 160719 + ... + 261255.

It is an arithmetic number, because the mean of its divisors is an integer number (776354436).

Almost surely, 2^21212000019 is an apocalyptic number.

21212000019 is a deficient number, since it is larger than the sum of its proper divisors (16053012909).

21212000019 is a wasteful number, since it uses less digits than its factorization.

21212000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100764 (or 100761 counting only the distinct ones).

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

The spelling of 21212000019 in words is "twenty-one billion, two hundred twelve million, nineteen", and thus it is an aban number.