21391272014 has 16 divisors (see below), whose sum is σ = 36682517088. Its totient is φ = 9164746752.

The previous prime is 21391272013. The next prime is 21391272017. The reversal of 21391272014 is 41027219312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21391272011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 199619 + ... + 287454.

It is an arithmetic number, because the mean of its divisors is an integer number (2292657318).

Almost surely, 2^21391272014 is an apocalyptic number.

21391272014 is a deficient number, since it is larger than the sum of its proper divisors (15291245074).

21391272014 is a wasteful number, since it uses less digits than its factorization.

21391272014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490219.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 21391272014 in words is "twenty-one billion, three hundred ninety-one million, two hundred seventy-two thousand, fourteen".