21213610642346 has 16 divisors (see below), whose sum is σ = 31830453476640. Its totient is φ = 10603459776240.

The previous prime is 21213610642291. The next prime is 21213610642361. The reversal of 21213610642346 is 64324601631212.

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 7 ways as a sum of consecutive naturals, for example, 178165685 + ... + 178284711.

It is an arithmetic number, because the mean of its divisors is an integer number (1989403342290).

Almost surely, 2^{21213610642346} is an apocalyptic number.

21213610642346 is a deficient number, since it is larger than the sum of its proper divisors (10616842834294).

21213610642346 is a wasteful number, since it uses less digits than its factorization.

21213610642346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146389.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 21213610642346 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-two thousand, three hundred forty-six".