21318606357 has 8 divisors (see below), whose sum is σ = 28767276384. Its totient is φ = 14041170288.

The previous prime is 21318606341. The next prime is 21318606371. The reversal of 21318606357 is 75360681312.

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

It is not a de Polignac number, because 21318606357 - 2⁴ = 21318606341 is a prime.

It is a super-2 number, since 2×21318606357² (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 (21318606307) 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, 42808198 + ... + 42808695.

It is an arithmetic number, because the mean of its divisors is an integer number (3595909548).

Almost surely, 2^21318606357 is an apocalyptic number.

It is an amenable number.

21318606357 is a deficient number, since it is larger than the sum of its proper divisors (7448670027).

21318606357 is an equidigital number, since it uses as much as digits as its factorization.

21318606357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85616979.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 21318606357 in words is "twenty-one billion, three hundred eighteen million, six hundred six thousand, three hundred fifty-seven".