221121002012210 has 16 divisors (see below), whose sum is σ = 398184408019800. Its totient is φ = 88411377605376.

The previous prime is 221121002012177. The next prime is 221121002012303. The reversal of 221121002012210 is 12210200121122.

It can be written as a sum of positive squares in 4 ways, for example, as 146347643240929 + 74773358771281 = 12097423^2 + 8647159^2 .

It is a super-5 number, since 5×221121002012210⁵ (a number of 73 digits) contains 55555 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4627874855 + ... + 4627922634.

Almost surely, 2^{221121002012210} is an apocalyptic number.

221121002012210 is a deficient number, since it is larger than the sum of its proper divisors (177063406007590).

221121002012210 is a wasteful number, since it uses less digits than its factorization.

221121002012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9255799885.

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

Adding to 221121002012210 its reverse (12210200121122), we get a palindrome (233331202133332).

The spelling of 221121002012210 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two million, twelve thousand, two hundred ten".