19552421 has 12 divisors (see below), whose sum is σ = 23037120. Its totient is φ = 16543800.

The previous prime is 19552361. The next prime is 19552433. The reversal of 19552421 is 12425591.

It is a de Polignac number, because none of the positive numbers 2^k-19552421 is a prime.

It is a super-2 number, since 2×19552421² = 764594333922482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19552441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1346 + ... + 6396.

It is an arithmetic number, because the mean of its divisors is an integer number (1919760).

Almost surely, 2^19552421 is an apocalyptic number.

It is an amenable number.

19552421 is a deficient number, since it is larger than the sum of its proper divisors (3484699).

19552421 is an equidigital number, since it uses as much as digits as its factorization.

19552421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5144 (or 5137 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 19552421 is about 4421.8119589146. The cubic root of 19552421 is about 269.4016057291.

The spelling of 19552421 in words is "nineteen million, five hundred fifty-two thousand, four hundred twenty-one".