2121220121234 has 4 divisors (see below), whose sum is σ = 3181830181854. Its totient is φ = 1060610060616.

The previous prime is 2121220121233. The next prime is 2121220121299. The reversal of 2121220121234 is 4321210221212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1175955892225 + 945264229009 = 1084415^2 + 972247^2 .

It is not an unprimeable number, because it can be changed into a prime (2121220121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530305030307 + ... + 530305030310.

Almost surely, 2^{2121220121234} is an apocalyptic number.

2121220121234 is a deficient number, since it is larger than the sum of its proper divisors (1060610060620).

2121220121234 is a wasteful number, since it uses less digits than its factorization.

2121220121234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060610060619.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 2121220121234 its reverse (4321210221212), we get a palindrome (6442430342446).

The spelling of 2121220121234 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred thirty-four".