21856201070 has 16 divisors (see below), whose sum is σ = 42917631408. Its totient is φ = 7947709440.

The previous prime is 21856201063. The next prime is 21856201093. The reversal of 21856201070 is 7010265812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99346259 + ... + 99346478.

It is an arithmetic number, because the mean of its divisors is an integer number (2682351963).

Almost surely, 2^21856201070 is an apocalyptic number.

21856201070 is a deficient number, since it is larger than the sum of its proper divisors (21061430338).

21856201070 is a wasteful number, since it uses less digits than its factorization.

21856201070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198692755.

The product of its (nonzero) digits is 6720, while the sum is 32.

Adding to 21856201070 its reverse (7010265812), we get a palindrome (28866466882).

The spelling of 21856201070 in words is "twenty-one billion, eight hundred fifty-six million, two hundred one thousand, seventy".