21527699197 has 8 divisors (see below), whose sum is σ = 21936867840. Its totient is φ = 21121619040.

The previous prime is 21527699189. The next prime is 21527699203. The reversal of 21527699197 is 79199672512.

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 21527699197 - 2³ = 21527699189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21527699147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758047 + ... + 785932.

It is an arithmetic number, because the mean of its divisors is an integer number (2742108480).

Almost surely, 2^21527699197 is an apocalyptic number.

It is an amenable number.

21527699197 is a deficient number, since it is larger than the sum of its proper divisors (409168643).

21527699197 is a wasteful number, since it uses less digits than its factorization.

21527699197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544243.

The product of its digits is 4286520, while the sum is 58.

The spelling of 21527699197 in words is "twenty-one billion, five hundred twenty-seven million, six hundred ninety-nine thousand, one hundred ninety-seven".