21906670216834 has 32 divisors (see below), whose sum is σ = 35643423936960. Its totient is φ = 10037710976832.

The previous prime is 21906670216831. The next prime is 21906670216909. The reversal of 21906670216834 is 43861207660912.

It is not an unprimeable number, because it can be changed into a prime (21906670216831) 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 15 ways as a sum of consecutive naturals, for example, 141927769 + ... + 142082035.

It is an arithmetic number, because the mean of its divisors is an integer number (1113856998030).

Almost surely, 2^{21906670216834} is an apocalyptic number.

21906670216834 is a deficient number, since it is larger than the sum of its proper divisors (13736753720126).

21906670216834 is a wasteful number, since it uses less digits than its factorization.

21906670216834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193714.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 21906670216834 in words is "twenty-one trillion, nine hundred six billion, six hundred seventy million, two hundred sixteen thousand, eight hundred thirty-four".