2121522566 has 16 divisors (see below), whose sum is σ = 3257772480. Its totient is φ = 1035706560.

The previous prime is 2121522547. The next prime is 2121522593. The reversal of 2121522566 is 6652251212.

It is a congruent number.

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, 12770 + ... + 66378.

It is an arithmetic number, because the mean of its divisors is an integer number (203610780).

Almost surely, 2^2121522566 is an apocalyptic number.

2121522566 is a deficient number, since it is larger than the sum of its proper divisors (1136249914).

2121522566 is a wasteful number, since it uses less digits than its factorization.

2121522566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54079.

The product of its digits is 14400, while the sum is 32.

The square root of 2121522566 is about 46059.9887755088. The cubic root of 2121522566 is about 1284.9391213014.

Adding to 2121522566 its reverse (6652251212), we get a palindrome (8773773778).

The spelling of 2121522566 in words is "two billion, one hundred twenty-one million, five hundred twenty-two thousand, five hundred sixty-six".