21225397771 has 8 divisors (see below), whose sum is σ = 21421469888. Its totient is φ = 21030192000.

The previous prime is 21225397757. The next prime is 21225397799. The reversal of 21225397771 is 17779352212.

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 21225397771 - 2⁷ = 21225397643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21225397741) 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, 167310 + ... + 265411.

It is an arithmetic number, because the mean of its divisors is an integer number (2677683736).

Almost surely, 2^21225397771 is an apocalyptic number.

21225397771 is a deficient number, since it is larger than the sum of its proper divisors (196072117).

21225397771 is a wasteful number, since it uses less digits than its factorization.

21225397771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433173.

The product of its digits is 370440, while the sum is 46.

The spelling of 21225397771 in words is "twenty-one billion, two hundred twenty-five million, three hundred ninety-seven thousand, seven hundred seventy-one".