21197827607 has 8 divisors (see below), whose sum is σ = 23134945680. Its totient is φ = 19262383360.

The previous prime is 21197827597. The next prime is 21197827661. The reversal of 21197827607 is 70672879112.

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 21197827607 - 2⁶ = 21197827543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21197827507) 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, 391898 + ... + 442695.

It is an arithmetic number, because the mean of its divisors is an integer number (2891868210).

Almost surely, 2^21197827607 is an apocalyptic number.

21197827607 is a deficient number, since it is larger than the sum of its proper divisors (1937118073).

21197827607 is a wasteful number, since it uses less digits than its factorization.

21197827607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836913.

The product of its (nonzero) digits is 592704, while the sum is 50.

The spelling of 21197827607 in words is "twenty-one billion, one hundred ninety-seven million, eight hundred twenty-seven thousand, six hundred seven".