21847741368 has 32 divisors (see below), whose sum is σ = 56502781200. Its totient is φ = 7031456768.

The previous prime is 21847741361. The next prime is 21847741411. The reversal of 21847741368 is 86314774812.

It is a super-2 number, since 2×21847741368² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21847741368.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21847741361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15694521 + ... + 15695912.

Almost surely, 2^21847741368 is an apocalyptic number.

It is an amenable number.

21847741368 is an abundant number, since it is smaller than the sum of its proper divisors (34655039832).

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

21847741368 is a wasteful number, since it uses less digits than its factorization.

21847741368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31390471 (or 31390467 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 51.

The spelling of 21847741368 in words is "twenty-one billion, eight hundred forty-seven million, seven hundred forty-one thousand, three hundred sixty-eight".