21256225331 has 8 divisors (see below), whose sum is σ = 23371198464. Its totient is φ = 19171683720.

The previous prime is 21256225321. The next prime is 21256225373. The reversal of 21256225331 is 13352265212.

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 21256225331 - 2¹⁰ = 21256224307 is a prime.

It is a super-2 number, since 2×21256225331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21256225301) 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, 7606415 + ... + 7609208.

It is an arithmetic number, because the mean of its divisors is an integer number (2921399808).

Almost surely, 2^21256225331 is an apocalyptic number.

21256225331 is a deficient number, since it is larger than the sum of its proper divisors (2114973133).

21256225331 is a wasteful number, since it uses less digits than its factorization.

21256225331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15215761.

The product of its digits is 21600, while the sum is 32.

The spelling of 21256225331 in words is "twenty-one billion, two hundred fifty-six million, two hundred twenty-five thousand, three hundred thirty-one".