21130397771 has 8 divisors (see below), whose sum is σ = 24374718720. Its totient is φ = 17942500008.

The previous prime is 21130397767. The next prime is 21130397773. The reversal of 21130397771 is 17779303112.

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 21130397771 - 2² = 21130397767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130397773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14104991 + ... + 14106488.

It is an arithmetic number, because the mean of its divisors is an integer number (3046839840).

Almost surely, 2^21130397771 is an apocalyptic number.

21130397771 is a deficient number, since it is larger than the sum of its proper divisors (3244320949).

21130397771 is a wasteful number, since it uses less digits than its factorization.

21130397771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28211593.

The product of its (nonzero) digits is 55566, while the sum is 41.

The spelling of 21130397771 in words is "twenty-one billion, one hundred thirty million, three hundred ninety-seven thousand, seven hundred seventy-one".