21014127309 has 48 divisors (see below), whose sum is σ = 32905642176. Its totient is φ = 11893593600.

The previous prime is 21014127283. The next prime is 21014127311. The reversal of 21014127309 is 90372141012.

It is not a de Polignac number, because 21014127309 - 2¹³ = 21014119117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014122309) 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, 6977614 + ... + 6980624.

It is an arithmetic number, because the mean of its divisors is an integer number (685534212).

Almost surely, 2^21014127309 is an apocalyptic number.

It is an amenable number.

21014127309 is a deficient number, since it is larger than the sum of its proper divisors (11891514867).

21014127309 is a wasteful number, since it uses less digits than its factorization.

21014127309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466 (or 3459 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 21014127309 in words is "twenty-one billion, fourteen million, one hundred twenty-seven thousand, three hundred nine".