212121220121012 has 48 divisors (see below), whose sum is σ = 382398307279632. Its totient is φ = 102925187850240.

The previous prime is 212121220120987. The next prime is 212121220121021. The reversal of 212121220121012 is 210121022121212.

It can be written as a sum of positive squares in 8 ways, for example, as 2355936428836 + 209765283692176 = 1534906^2 + 14483276^2 .

It is a congruent number.

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, 18941939 + ... + 27982842.

It is an arithmetic number, because the mean of its divisors is an integer number (7966631401659).

Almost surely, 2^{212121220121012} is an apocalyptic number.

It is an amenable number.

212121220121012 is a deficient number, since it is larger than the sum of its proper divisors (170277087158620).

212121220121012 is a wasteful number, since it uses less digits than its factorization.

212121220121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46925108 (or 46925106 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212121220121012 its reverse (210121022121212), we get a palindrome (422242242242224).

The spelling of 212121220121012 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, twelve".