2121220121210 has 16 divisors (see below), whose sum is σ = 3822025921416. Its totient is φ = 847637003328.

The previous prime is 2121220121201. The next prime is 2121220121231. The reversal of 2121220121210 is 121210221212.

It can be written as a sum of positive squares in 4 ways, for example, as 1448621666569 + 672598454641 = 1203587^2 + 820121^2 .

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, 106370177 + ... + 106390116.

Almost surely, 2^{2121220121210} is an apocalyptic number.

2121220121210 is a deficient number, since it is larger than the sum of its proper divisors (1700805800206).

2121220121210 is a wasteful number, since it uses less digits than its factorization.

2121220121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212761297.

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

Adding to 2121220121210 its reverse (121210221212), we get a palindrome (2242430342422).

The spelling of 2121220121210 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred ten".