1000021221222 has 32 divisors (see below), whose sum is σ = 2021527352544. Its totient is φ = 329762534400.

The previous prime is 1000021221197. The next prime is 1000021221289. The reversal of 1000021221222 is 2221221200001.

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, 995472 + ... + 1729452.

It is an arithmetic number, because the mean of its divisors is an integer number (63172729767).

Almost surely, 2^{1000021221222} is an apocalyptic number.

1000021221222 is an abundant number, since it is smaller than the sum of its proper divisors (1021506131322).

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

1000021221222 is a wasteful number, since it uses less digits than its factorization.

1000021221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736424.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1000021221222 its reverse (2221221200001), we get a palindrome (3221242421223).

The spelling of 1000021221222 in words is "one trillion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".