21758061347 has 8 divisors (see below), whose sum is σ = 23819943360. Its totient is φ = 19710158760.

The previous prime is 21758061319. The next prime is 21758061379. The reversal of 21758061347 is 74316085712.

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

It is a cyclic number.

It is not a de Polignac number, because 21758061347 - 2²⁸ = 21489625891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21758061298 and 21758061307.

It is not an unprimeable number, because it can be changed into a prime (21758061397) 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, 3491597 + ... + 3497822.

It is an arithmetic number, because the mean of its divisors is an integer number (2977492920).

Almost surely, 2^21758061347 is an apocalyptic number.

21758061347 is a deficient number, since it is larger than the sum of its proper divisors (2061882013).

21758061347 is a wasteful number, since it uses less digits than its factorization.

21758061347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6989713.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 21758061347 in words is "twenty-one billion, seven hundred fifty-eight million, sixty-one thousand, three hundred forty-seven".