21947700369 has 8 divisors (see below), whose sum is σ = 33444114880. Its totient is φ = 12541543056.

The previous prime is 21947700361. The next prime is 21947700371. The reversal of 21947700369 is 96300774912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21947700369 - 2³ = 21947700361 is a prime.

It is a super-2 number, since 2×21947700369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21947700361) 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, 522564274 + ... + 522564315.

It is an arithmetic number, because the mean of its divisors is an integer number (4180514360).

Almost surely, 2^21947700369 is an apocalyptic number.

It is an amenable number.

21947700369 is a deficient number, since it is larger than the sum of its proper divisors (11496414511).

21947700369 is a wasteful number, since it uses less digits than its factorization.

21947700369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045128599.

The product of its (nonzero) digits is 571536, while the sum is 48.

The spelling of 21947700369 in words is "twenty-one billion, nine hundred forty-seven million, seven hundred thousand, three hundred sixty-nine".