21351108345730 has 64 divisors (see below), whose sum is σ = 41496000572160. Its totient is φ = 7885488796416.

The previous prime is 21351108345719. The next prime is 21351108345761. The reversal of 21351108345730 is 3754380115312.

It is a super-2 number, since 2×21351108345730² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26909269 + ... + 27691351.

It is an arithmetic number, because the mean of its divisors is an integer number (648375008940).

Almost surely, 2^{21351108345730} is an apocalyptic number.

21351108345730 is a deficient number, since it is larger than the sum of its proper divisors (20144892226430).

21351108345730 is a wasteful number, since it uses less digits than its factorization.

21351108345730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786235.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 21351108345730 in words is "twenty-one trillion, three hundred fifty-one billion, one hundred eight million, three hundred forty-five thousand, seven hundred thirty".