21241072287 has 32 divisors (see below), whose sum is σ = 33152000000. Its totient is φ = 13404268800.

The previous prime is 21241072273. The next prime is 21241072291. The reversal of 21241072287 is 78227014212.

21241072287 is a `hidden beast` number, since 2 + 12 + 410 + 7 + 228 + 7 = 666.

It is not a de Polignac number, because 21241072287 - 2²³ = 21232683679 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 (21241072247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 624162 + ... + 657312.

It is an arithmetic number, because the mean of its divisors is an integer number (1036000000).

Almost surely, 2^21241072287 is an apocalyptic number.

21241072287 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21241072287 is a deficient number, since it is larger than the sum of its proper divisors (11910927713).

21241072287 is a wasteful number, since it uses less digits than its factorization.

21241072287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34428 (or 34422 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

Adding to 21241072287 its reverse (78227014212), we get a palindrome (99468086499).

The spelling of 21241072287 in words is "twenty-one billion, two hundred forty-one million, seventy-two thousand, two hundred eighty-seven".