1211222021001 has 8 divisors (see below), whose sum is σ = 1614970257600. Its totient is φ = 807477565872.

The previous prime is 1211222020969. The next prime is 1211222021027. The reversal of 1211222021001 is 1001202221121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211222021001 - 2⁵ = 1211222020969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211222021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86526 + ... + 1558823.

It is an arithmetic number, because the mean of its divisors is an integer number (201871282200).

Almost surely, 2^{1211222021001} is an apocalyptic number.

It is an amenable number.

1211222021001 is a deficient number, since it is larger than the sum of its proper divisors (403748236599).

1211222021001 is a wasteful number, since it uses less digits than its factorization.

1211222021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890735.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211222021001 its reverse (1001202221121), we get a palindrome (2212424242122).

The spelling of 1211222021001 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, twenty-one thousand, one".