16421435516 has 12 divisors (see below), whose sum is σ = 28739456760. Its totient is φ = 8210162160.

The previous prime is 16421435473. The next prime is 16421435519. The reversal of 16421435516 is 61553412461.

It is a super-2 number, since 2×16421435516² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16421435516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421435519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68426 + ... + 193713.

It is an arithmetic number, because the mean of its divisors is an integer number (2394954730).

Almost surely, 2^16421435516 is an apocalyptic number.

It is an amenable number.

16421435516 is a deficient number, since it is larger than the sum of its proper divisors (12318021244).

16421435516 is a wasteful number, since it uses less digits than its factorization.

16421435516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277804 (or 277802 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

Adding to 16421435516 its reverse (61553412461), we get a palindrome (77974847977).

The spelling of 16421435516 in words is "sixteen billion, four hundred twenty-one million, four hundred thirty-five thousand, five hundred sixteen".