21069330397 has 4 divisors (see below), whose sum is σ = 21082442976. Its totient is φ = 21056217820.

The previous prime is 21069330383. The next prime is 21069330407. The reversal of 21069330397 is 79303396012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21069330397 - 2¹⁵ = 21069297629 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 (21069330377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6553879 + ... + 6557092.

It is an arithmetic number, because the mean of its divisors is an integer number (5270610744).

Almost surely, 2^21069330397 is an apocalyptic number.

It is an amenable number.

21069330397 is a deficient number, since it is larger than the sum of its proper divisors (13112579).

21069330397 is a wasteful number, since it uses less digits than its factorization.

21069330397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13112578.

The product of its (nonzero) digits is 183708, while the sum is 43.

The spelling of 21069330397 in words is "twenty-one billion, sixty-nine million, three hundred thirty thousand, three hundred ninety-seven".