21865071290 has 32 divisors (see below), whose sum is σ = 40529047680. Its totient is φ = 8488194624.

The previous prime is 21865071289. The next prime is 21865071341. The reversal of 21865071290 is 9217056812.

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, 94430 + ... + 229449.

It is an arithmetic number, because the mean of its divisors is an integer number (1266532740).

Almost surely, 2^21865071290 is an apocalyptic number.

21865071290 is a deficient number, since it is larger than the sum of its proper divisors (18663976390).

21865071290 is a wasteful number, since it uses less digits than its factorization.

21865071290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324086.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 21865071290 in words is "twenty-one billion, eight hundred sixty-five million, seventy-one thousand, two hundred ninety".