15550355421 has 24 divisors (see below), whose sum is σ = 23655996000. Its totient is φ = 9816217632.

The previous prime is 15550355363. The next prime is 15550355423. The reversal of 15550355421 is 12455305551.

15550355421 is a `hidden beast` number, since 1 + 5 + 550 + 35 + 54 + 21 = 666.

It is not a de Polignac number, because 15550355421 - 2¹⁰ = 15550354397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550355423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324550 + ... + 369368.

It is an arithmetic number, because the mean of its divisors is an integer number (985666500).

Almost surely, 2^15550355421 is an apocalyptic number.

It is an amenable number.

15550355421 is a deficient number, since it is larger than the sum of its proper divisors (8105640579).

15550355421 is a wasteful number, since it uses less digits than its factorization.

15550355421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46873 (or 46870 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 15550355421 in words is "fifteen billion, five hundred fifty million, three hundred fifty-five thousand, four hundred twenty-one".