21121002215416 has 16 divisors (see below), whose sum is σ = 39993976968840. Its totient is φ = 10455941690400.

The previous prime is 21121002215389. The next prime is 21121002215483. The reversal of 21121002215416 is 61451220012112.

It is a super-3 number, since 3×21121002215416³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13069926306 + ... + 13069927921.

Almost surely, 2^{21121002215416} is an apocalyptic number.

It is an amenable number.

21121002215416 is a deficient number, since it is larger than the sum of its proper divisors (18872974753424).

21121002215416 is a wasteful number, since it uses less digits than its factorization.

21121002215416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26139854334 (or 26139854330 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

Adding to 21121002215416 its reverse (61451220012112), we get a palindrome (82572222227528).

The spelling of 21121002215416 in words is "twenty-one trillion, one hundred twenty-one billion, two million, two hundred fifteen thousand, four hundred sixteen".