221000201011812 has 24 divisors (see below), whose sum is σ = 515859047617536. Its totient is φ = 73639317681568.

The previous prime is 221000201011789. The next prime is 221000201011813. The reversal of 221000201011812 is 218110102000122.

It is a super-2 number, since 2×221000201011812² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221000201011813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3426965043 + ... + 3427029530.

It is an arithmetic number, because the mean of its divisors is an integer number (21494126984064).

Almost surely, 2^{221000201011812} is an apocalyptic number.

It is an amenable number.

221000201011812 is an abundant number, since it is smaller than the sum of its proper divisors (294858846605724).

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

221000201011812 is a wasteful number, since it uses less digits than its factorization.

221000201011812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6853997267 (or 6853997265 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221000201011812 its reverse (218110102000122), we get a palindrome (439110303011934).

The spelling of 221000201011812 in words is "two hundred twenty-one trillion, two hundred one million, eleven thousand, eight hundred twelve".