21357552666830 has 8 divisors (see below), whose sum is σ = 38443594800312. Its totient is φ = 8543021066728.

The previous prime is 21357552666829. The next prime is 21357552666869. The reversal of 21357552666830 is 3866625575312.

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

It is a super-2 number, since 2×21357552666830² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21357552666830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067877633332 + ... + 1067877633351.

It is an arithmetic number, because the mean of its divisors is an integer number (4805449350039).

Almost surely, 2^{21357552666830} is an apocalyptic number.

21357552666830 is a deficient number, since it is larger than the sum of its proper divisors (17086042133482).

21357552666830 is a wasteful number, since it uses less digits than its factorization.

21357552666830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135755266690.

The product of its (nonzero) digits is 54432000, while the sum is 59.

The spelling of 21357552666830 in words is "twenty-one trillion, three hundred fifty-seven billion, five hundred fifty-two million, six hundred sixty-six thousand, eight hundred thirty".