12021402309 has 24 divisors (see below), whose sum is σ = 18951117408. Its totient is φ = 6756755040.

The previous prime is 12021402307. The next prime is 12021402317. The reversal of 12021402309 is 90320412021.

It is not a de Polignac number, because 12021402309 - 2¹ = 12021402307 is a prime.

It is a super-2 number, since 2×12021402309² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021402307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 661347 + ... + 679280.

It is an arithmetic number, because the mean of its divisors is an integer number (789629892).

Almost surely, 2^12021402309 is an apocalyptic number.

It is an amenable number.

12021402309 is a deficient number, since it is larger than the sum of its proper divisors (6929715099).

12021402309 is a wasteful number, since it uses less digits than its factorization.

12021402309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340705 (or 1340698 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The spelling of 12021402309 in words is "twelve billion, twenty-one million, four hundred two thousand, three hundred nine".