21489842425 has 24 divisors (see below), whose sum is σ = 28330668864. Its totient is φ = 16134106560.

The previous prime is 21489842401. The next prime is 21489842447. The reversal of 21489842425 is 52424898412.

It is a de Polignac number, because none of the positive numbers 2^k-21489842425 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 322107 + ... + 383056.

It is an arithmetic number, because the mean of its divisors is an integer number (1180444536).

Almost surely, 2^21489842425 is an apocalyptic number.

21489842425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21489842425 is a deficient number, since it is larger than the sum of its proper divisors (6840826439).

21489842425 is a wasteful number, since it uses less digits than its factorization.

21489842425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705249 (or 705244 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 49.

The spelling of 21489842425 in words is "twenty-one billion, four hundred eighty-nine million, eight hundred forty-two thousand, four hundred twenty-five".