21244460421 has 16 divisors (see below), whose sum is σ = 28402799040. Its totient is φ = 14124599040.

The previous prime is 21244460407. The next prime is 21244460437. The reversal of 21244460421 is 12406444212.

It is not a de Polignac number, because 21244460421 - 2⁶ = 21244460357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244460401) 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 15 ways as a sum of consecutive naturals, for example, 1896166 + ... + 1907336.

It is an arithmetic number, because the mean of its divisors is an integer number (1775174940).

Almost surely, 2^21244460421 is an apocalyptic number.

It is an amenable number.

21244460421 is a deficient number, since it is larger than the sum of its proper divisors (7158338619).

21244460421 is a wasteful number, since it uses less digits than its factorization.

21244460421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12836.

The product of its (nonzero) digits is 12288, while the sum is 30.

The spelling of 21244460421 in words is "twenty-one billion, two hundred forty-four million, four hundred sixty thousand, four hundred twenty-one".