21919410870434 has 64 divisors (see below), whose sum is σ = 42664179769344. Its totient is φ = 8264545146000.

The previous prime is 21919410870431. The next prime is 21919410870473. The reversal of 21919410870434 is 43407801491912.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21919410870431) by changing a digit.

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, 18395132 + ... + 19550439.

It is an arithmetic number, because the mean of its divisors is an integer number (666627808896).

Almost surely, 2^{21919410870434} is an apocalyptic number.

21919410870434 is a deficient number, since it is larger than the sum of its proper divisors (20744768898910).

21919410870434 is a wasteful number, since it uses less digits than its factorization.

21919410870434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37945644 (or 37945622 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 21919410870434 in words is "twenty-one trillion, nine hundred nineteen billion, four hundred ten million, eight hundred seventy thousand, four hundred thirty-four".