21211009393 has 16 divisors (see below), whose sum is σ = 25094321280. Its totient is φ = 17541853056.

The previous prime is 21211009387. The next prime is 21211009397. The reversal of 21211009393 is 39390011212.

It is not a de Polignac number, because 21211009393 - 2³³ = 12621074801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211009397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265821 + ... + 336277.

It is an arithmetic number, because the mean of its divisors is an integer number (1568395080).

Almost surely, 2^21211009393 is an apocalyptic number.

It is an amenable number.

21211009393 is a deficient number, since it is larger than the sum of its proper divisors (3883311887).

21211009393 is a wasteful number, since it uses less digits than its factorization.

21211009393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71976.

The product of its (nonzero) digits is 2916, while the sum is 31.

The spelling of 21211009393 in words is "twenty-one billion, two hundred eleven million, nine thousand, three hundred ninety-three".