21213610642345 has 32 divisors (see below), whose sum is σ = 27814984813440. Its totient is φ = 15403395517440.

The previous prime is 21213610642291. The next prime is 21213610642361. The reversal of 21213610642345 is 54324601631212.

It is not a de Polignac number, because 21213610642345 - 2²⁷ = 21213476424617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213610642298 and 21213610642307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 864684699 + ... + 864709231.

It is an arithmetic number, because the mean of its divisors is an integer number (869218275420).

Almost surely, 2^{21213610642345} is an apocalyptic number.

It is an amenable number.

21213610642345 is a deficient number, since it is larger than the sum of its proper divisors (6601374171095).

21213610642345 is a wasteful number, since it uses less digits than its factorization.

21213610642345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49065.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 21213610642345 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-two thousand, three hundred forty-five".