21910449439 has 16 divisors (see below), whose sum is σ = 23635540800. Its totient is φ = 20236677120.

The previous prime is 21910449403. The next prime is 21910449461. The reversal of 21910449439 is 93494401912.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21910449439 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 (21910449499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202599 + ... + 291319.

It is an arithmetic number, because the mean of its divisors is an integer number (1477221300).

Almost surely, 2^21910449439 is an apocalyptic number.

21910449439 is a deficient number, since it is larger than the sum of its proper divisors (1725091361).

21910449439 is a wasteful number, since it uses less digits than its factorization.

21910449439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89010.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 21910449439 in words is "twenty-one billion, nine hundred ten million, four hundred forty-nine thousand, four hundred thirty-nine".