21421323297 has 48 divisors (see below), whose sum is σ = 35760890880. Its totient is φ = 12211929600.

The previous prime is 21421323277. The next prime is 21421323307. The reversal of 21421323297 is 79232312412.

21421323297 is a `hidden beast` number, since 2 + 1 + 42 + 1 + 323 + 297 = 666.

It is not a de Polignac number, because 21421323297 - 2⁷ = 21421323169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21421323247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4843147 + ... + 4847567.

It is an arithmetic number, because the mean of its divisors is an integer number (745018560).

Almost surely, 2^21421323297 is an apocalyptic number.

It is an amenable number.

21421323297 is a deficient number, since it is larger than the sum of its proper divisors (14339567583).

21421323297 is a wasteful number, since it uses less digits than its factorization.

21421323297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334 (or 7331 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The spelling of 21421323297 in words is "twenty-one billion, four hundred twenty-one million, three hundred twenty-three thousand, two hundred ninety-seven".