21855468270 has 16 divisors (see below), whose sum is σ = 52453123920. Its totient is φ = 5828124864.

The previous prime is 21855468259. The next prime is 21855468281. The reversal of 21855468270 is 7286455812.

It is an interprime number because it is at equal distance from previous prime (21855468259) and next prime (21855468281).

It is a super-2 number, since 2×21855468270² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364257775 + ... + 364257834.

It is an arithmetic number, because the mean of its divisors is an integer number (3278320245).

Almost surely, 2^21855468270 is an apocalyptic number.

21855468270 is an abundant number, since it is smaller than the sum of its proper divisors (30597655650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21855468270 is a wasteful number, since it uses less digits than its factorization.

21855468270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728515619.

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 21855468270 in words is "twenty-one billion, eight hundred fifty-five million, four hundred sixty-eight thousand, two hundred seventy".