216021620197836 has 288 divisors, whose sum is σ = 577978513728000. Its totient is φ = 69769827404928.

The previous prime is 216021620197813. The next prime is 216021620197871. The reversal of 216021620197836 is 638791026120612.

It is a happy number.

216021620197836 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 2 + 1 + 620 + 1 + 9 + 7 + 8 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 46326744441 + ... + 46326749103.

Almost surely, 2^{216021620197836} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216021620197836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288989256864000).

216021620197836 is an abundant number, since it is smaller than the sum of its proper divisors (361956893530164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216021620197836 is a wasteful number, since it uses less digits than its factorization.

216021620197836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570 (or 6519 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 216021620197836 in words is "two hundred sixteen trillion, twenty-one billion, six hundred twenty million, one hundred ninety-seven thousand, eight hundred thirty-six".