Adding to 1211001022158 its reverse (8512201001121), we get a palindrome (9723202023279).
It is a sphenic number, since it is the product of 3 distinct primes.
1211001022158 is an admirable number.
It is a congruent number.
Almost surely, 21211001022158 is an apocalyptic number.
1211001022158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1211001022158 is a wasteful number, since it uses less digits than its factorization.
1211001022158 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 201833503698.
The spelling of 1211001022158 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, one hundred fifty-eight".