216221818883029 has 16 divisors (see below), whose sum is σ = 220787232659136. Its totient is φ = 211690204934400.

The previous prime is 216221818882999. The next prime is 216221818883033. The reversal of 216221818883029 is 920388818122612.

It is a cyclic number.

It is not a de Polignac number, because 216221818883029 - 2¹³ = 216221818874837 is a prime.

It is a super-2 number, since 2×216221818883029² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216221818883069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26170914 + ... + 33426940.

It is an arithmetic number, because the mean of its divisors is an integer number (13799202041196).

Almost surely, 2^{216221818883029} is an apocalyptic number.

It is an amenable number.

216221818883029 is a deficient number, since it is larger than the sum of its proper divisors (4565413776107).

216221818883029 is a wasteful number, since it uses less digits than its factorization.

216221818883029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7258356.

The product of its (nonzero) digits is 10616832, while the sum is 61.

The spelling of 216221818883029 in words is "two hundred sixteen trillion, two hundred twenty-one billion, eight hundred eighteen million, eight hundred eighty-three thousand, twenty-nine".