21016839242 has 16 divisors (see below), whose sum is σ = 36047380992. Its totient is φ = 9002588400.

The previous prime is 21016839223. The next prime is 21016839269. The reversal of 21016839242 is 24293861012.

It is a super-2 number, since 2×21016839242² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21016839196 and 21016839205.

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, 357413 + ... + 412040.

It is an arithmetic number, because the mean of its divisors is an integer number (2252961312).

Almost surely, 2^21016839242 is an apocalyptic number.

21016839242 is a deficient number, since it is larger than the sum of its proper divisors (15030541750).

21016839242 is a wasteful number, since it uses less digits than its factorization.

21016839242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771413.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 21016839242 in words is "twenty-one billion, sixteen million, eight hundred thirty-nine thousand, two hundred forty-two".