21080834890 has 16 divisors (see below), whose sum is σ = 38096684640. Its totient is φ = 8398738000.

The previous prime is 21080834813. The next prime is 21080834927. The reversal of 21080834890 is 9843808012.

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, 4196860 + ... + 4201879.

It is an arithmetic number, because the mean of its divisors is an integer number (2381042790).

Almost surely, 2^21080834890 is an apocalyptic number.

21080834890 is a deficient number, since it is larger than the sum of its proper divisors (17015849750).

21080834890 is a wasteful number, since it uses less digits than its factorization.

21080834890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8398997.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 21080834890 in words is "twenty-one billion, eighty million, eight hundred thirty-four thousand, eight hundred ninety".