21019092012 has 36 divisors (see below), whose sum is σ = 53363630320. Its totient is φ = 6975765792.

The previous prime is 21019092001. The next prime is 21019092047. The reversal of 21019092012 is 21029091012.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1266568 + ... + 1283055.

Almost surely, 2^21019092012 is an apocalyptic number.

It is an amenable number.

21019092012 is an abundant number, since it is smaller than the sum of its proper divisors (32344538308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21019092012 is a wasteful number, since it uses less digits than its factorization.

21019092012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549862 (or 2549857 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 21019092012 in words is "twenty-one billion, nineteen million, ninety-two thousand, twelve".