21861447152 has 40 divisors (see below), whose sum is σ = 43011320016. Its totient is φ = 10761924096.

The previous prime is 21861447137. The next prime is 21861447173. The reversal of 21861447152 is 25174416812.

It is a super-2 number, since 2×21861447152² (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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2651228 + ... + 2659460.

Almost surely, 2^21861447152 is an apocalyptic number.

It is an amenable number.

21861447152 is a deficient number, since it is larger than the sum of its proper divisors (21149872864).

21861447152 is a wasteful number, since it uses less digits than its factorization.

21861447152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10785 (or 10779 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The spelling of 21861447152 in words is "twenty-one billion, eight hundred sixty-one million, four hundred forty-seven thousand, one hundred fifty-two".