221222121001010 has 32 divisors (see below), whose sum is σ = 398463643433520. Its totient is φ = 88430225006592.

The previous prime is 221222121001001. The next prime is 221222121001031. The reversal of 221222121001010 is 10100121222122.

It can be written as a sum of positive squares in 8 ways, for example, as 184401217872481 + 36820903128529 = 13579441^2 + 6068023^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221222121001010.

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, 410621132 + ... + 411159528.

Almost surely, 2^{221222121001010} is an apocalyptic number.

221222121001010 is a deficient number, since it is larger than the sum of its proper divisors (177241522432510).

221222121001010 is a wasteful number, since it uses less digits than its factorization.

221222121001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565550.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221222121001010 its reverse (10100121222122), we get a palindrome (231322242223132).

The spelling of 221222121001010 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, one thousand, ten".