2121212220010 has 16 divisors (see below), whose sum is σ = 4111888303656. Its totient is φ = 783216819648.

The previous prime is 2121212219989. The next prime is 2121212220011. The reversal of 2121212220010 is 100222121212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1809893974329 + 311318245681 = 1345323^2 + 557959^2 .

It is not an unprimeable number, because it can be changed into a prime (2121212220011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8158508409 + ... + 8158508668.

Almost surely, 2^{2121212220010} is an apocalyptic number.

2121212220010 is a deficient number, since it is larger than the sum of its proper divisors (1990676083646).

2121212220010 is a wasteful number, since it uses less digits than its factorization.

2121212220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16317017097.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2121212220010 its reverse (100222121212), we get a palindrome (2221434341222).

The spelling of 2121212220010 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, ten".