1000202122221 has 16 divisors (see below), whose sum is σ = 1403932208640. Its totient is φ = 631643713200.

The previous prime is 1000202122217. The next prime is 1000202122223. The reversal of 1000202122221 is 1222212020001.

It is not a de Polignac number, because 1000202122221 - 2² = 1000202122217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000202122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000202122223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292555 + ... + 1444296.

It is an arithmetic number, because the mean of its divisors is an integer number (87745763040).

Almost surely, 2^{1000202122221} is an apocalyptic number.

It is an amenable number.

1000202122221 is a deficient number, since it is larger than the sum of its proper divisors (403730086419).

1000202122221 is a wasteful number, since it uses less digits than its factorization.

1000202122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746976.

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

Adding to 1000202122221 its reverse (1222212020001), we get a palindrome (2222414142222).

The spelling of 1000202122221 in words is "one trillion, two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".