21241644633 has 32 divisors (see below), whose sum is σ = 35437363200. Its totient is φ = 12458437200.

The previous prime is 21241644617. The next prime is 21241644649. The reversal of 21241644633 is 33644614212.

21241644633 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 1 + 644 + 6 + 3 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21241644617) and next prime (21241644649).

It is not a de Polignac number, because 21241644633 - 2⁴ = 21241644617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21241644133) 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 31 ways as a sum of consecutive naturals, for example, 1144353 + ... + 1162766.

It is an arithmetic number, because the mean of its divisors is an integer number (1107417600).

Almost surely, 2^21241644633 is an apocalyptic number.

It is an amenable number.

21241644633 is a deficient number, since it is larger than the sum of its proper divisors (14195718567).

21241644633 is a wasteful number, since it uses less digits than its factorization.

21241644633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307170 (or 2307164 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

It can be divided in two parts, 212416 and 44633, that added together give a square (257049 = 507²).

The spelling of 21241644633 in words is "twenty-one billion, two hundred forty-one million, six hundred forty-four thousand, six hundred thirty-three".