1000021221206 has 32 divisors (see below), whose sum is σ = 1815290030592. Its totient is φ = 403342024320.

The previous prime is 1000021221197. The next prime is 1000021221289. The reversal of 1000021221206 is 6021221200001.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3496925 + ... + 3772071.

It is an arithmetic number, because the mean of its divisors is an integer number (56727813456).

Almost surely, 2^{1000021221206} is an apocalyptic number.

1000021221206 is a deficient number, since it is larger than the sum of its proper divisors (815268809386).

1000021221206 is a wasteful number, since it uses less digits than its factorization.

1000021221206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290444.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1000021221206 its reverse (6021221200001), we get a palindrome (7021242421207).

The spelling of 1000021221206 in words is "one trillion, twenty-one million, two hundred twenty-one thousand, two hundred six".