2121122221010 has 32 divisors (see below), whose sum is σ = 4149436016880. Its totient is φ = 775998413568.

The previous prime is 2121122220983. The next prime is 2121122221019. The reversal of 2121122221010 is 101222211212.

It can be written as a sum of positive squares in 8 ways, for example, as 177744030409 + 1943378190601 = 421597^2 + 1394051^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2121122221010.

It is not an unprimeable number, because it can be changed into a prime (2121122221019) 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, 74831357 + ... + 74859696.

Almost surely, 2^{2121122221010} is an apocalyptic number.

2121122221010 is a deficient number, since it is larger than the sum of its proper divisors (2028313795870).

2121122221010 is a wasteful number, since it uses less digits than its factorization.

2121122221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149691182.

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

Adding to 2121122221010 its reverse (101222211212), we get a palindrome (2222344432222).

The spelling of 2121122221010 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, ten".