21213610645434 has 16 divisors (see below), whose sum is σ = 42427664581440. Its totient is φ = 7071129666720.

The previous prime is 21213610645397. The next prime is 21213610645489. The reversal of 21213610645434 is 43454601631212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17846707 + ... + 18998214.

It is an arithmetic number, because the mean of its divisors is an integer number (2651729036340).

Almost surely, 2^{21213610645434} is an apocalyptic number.

21213610645434 is an abundant number, since it is smaller than the sum of its proper divisors (21214053936006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213610645434 is a wasteful number, since it uses less digits than its factorization.

21213610645434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36940885.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 21213610645434 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-five thousand, four hundred thirty-four".