15505421402 has 16 divisors (see below), whose sum is σ = 23530386600. Its totient is φ = 7662040320.

The previous prime is 15505421383. The next prime is 15505421417. The reversal of 15505421402 is 20412450551.

It can be written as a sum of positive squares in 4 ways, for example, as 8394041161 + 7111380241 = 91619^2 + 84329^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386924 + ... + 425112.

Almost surely, 2^15505421402 is an apocalyptic number.

15505421402 is a deficient number, since it is larger than the sum of its proper divisors (8024965198).

15505421402 is a wasteful number, since it uses less digits than its factorization.

15505421402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40561.

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 15505421402 its reverse (20412450551), we get a palindrome (35917871953).

The spelling of 15505421402 in words is "fifteen billion, five hundred five million, four hundred twenty-one thousand, four hundred two".