21491899319830 has 32 divisors (see below), whose sum is σ = 40368054820608. Its totient is φ = 8222852853600.

The previous prime is 21491899319797. The next prime is 21491899319881. The reversal of 21491899319830 is 3891399819412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13915365 + ... + 15382495.

It is an arithmetic number, because the mean of its divisors is an integer number (1261501713144).

Almost surely, 2^{21491899319830} is an apocalyptic number.

21491899319830 is a deficient number, since it is larger than the sum of its proper divisors (18876155500778).

21491899319830 is a wasteful number, since it uses less digits than its factorization.

21491899319830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530852.

The product of its (nonzero) digits is 30233088, while the sum is 67.

The spelling of 21491899319830 in words is "twenty-one trillion, four hundred ninety-one billion, eight hundred ninety-nine million, three hundred nineteen thousand, eight hundred thirty".