21016420036 has 48 divisors (see below), whose sum is σ = 38154557952. Its totient is φ = 10124150400.

The previous prime is 21016420027. The next prime is 21016420063. The reversal of 21016420036 is 63002461012.

It is a super-2 number, since 2×21016420036² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2716005 + ... + 2723731.

It is an arithmetic number, because the mean of its divisors is an integer number (794886624).

Almost surely, 2^21016420036 is an apocalyptic number.

It is an amenable number.

21016420036 is a deficient number, since it is larger than the sum of its proper divisors (17138137916).

21016420036 is a wasteful number, since it uses less digits than its factorization.

21016420036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8020 (or 8018 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21016420036 its reverse (63002461012), we get a palindrome (84018881048).

The spelling of 21016420036 in words is "twenty-one billion, sixteen million, four hundred twenty thousand, thirty-six".