21865270730 has 16 divisors (see below), whose sum is σ = 39417222240. Its totient is φ = 8732833872.

The previous prime is 21865270709. The next prime is 21865270759. The reversal of 21865270730 is 3707256812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652384 + ... + 1665563.

It is an arithmetic number, because the mean of its divisors is an integer number (2463576390).

Almost surely, 2^21865270730 is an apocalyptic number.

21865270730 is a deficient number, since it is larger than the sum of its proper divisors (17551951510).

21865270730 is a wasteful number, since it uses less digits than its factorization.

21865270730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318613.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 21865270730 in words is "twenty-one billion, eight hundred sixty-five million, two hundred seventy thousand, seven hundred thirty".