2121696628 has 24 divisors (see below), whose sum is σ = 3941331912. Its totient is φ = 995917824.

The previous prime is 2121696593. The next prime is 2121696641. The reversal of 2121696628 is 8266961212.

It can be written as a sum of positive squares in 4 ways, for example, as 694217104 + 1427479524 = 26348^2 + 37782^2 .

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, 12301 + ... + 66292.

It is an arithmetic number, because the mean of its divisors is an integer number (164222163).

Almost surely, 2^2121696628 is an apocalyptic number.

It is an amenable number.

2121696628 is a deficient number, since it is larger than the sum of its proper divisors (1819635284).

2121696628 is a wasteful number, since it uses less digits than its factorization.

2121696628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79011 (or 79009 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 2121696628 is about 46061.8782508920. The cubic root of 2121696628 is about 1284.9742616232.

The spelling of 2121696628 in words is "two billion, one hundred twenty-one million, six hundred ninety-six thousand, six hundred twenty-eight".