21351703407 has 8 divisors (see below), whose sum is σ = 28869909120. Its totient is φ = 14033983320.

The previous prime is 21351703349. The next prime is 21351703441. The reversal of 21351703407 is 70430715312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21351703407 - 2⁷ = 21351703279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351703007) 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 7 ways as a sum of consecutive naturals, for example, 50121157 + ... + 50121582.

It is an arithmetic number, because the mean of its divisors is an integer number (3608738640).

Almost surely, 2^21351703407 is an apocalyptic number.

21351703407 is a deficient number, since it is larger than the sum of its proper divisors (7518205713).

21351703407 is a wasteful number, since it uses less digits than its factorization.

21351703407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100242813.

The product of its (nonzero) digits is 17640, while the sum is 33.

The spelling of 21351703407 in words is "twenty-one billion, three hundred fifty-one million, seven hundred three thousand, four hundred seven".