2123821996 has 12 divisors (see below), whose sum is σ = 3767602552. Its totient is φ = 1047364128.

The previous prime is 2123821991. The next prime is 2123822021. The reversal of 2123821996 is 6991283212.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2123821991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3636390 + ... + 3636973.

Almost surely, 2^2123821996 is an apocalyptic number.

It is an amenable number.

2123821996 is a deficient number, since it is larger than the sum of its proper divisors (1643780556).

2123821996 is a wasteful number, since it uses less digits than its factorization.

2123821996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7273440 (or 7273438 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 2123821996 is about 46084.9432678397. The cubic root of 2123821996 is about 1285.4031843580.

It can be divided in two parts, 21238 and 21996, that added together give a palindrome (43234).

The spelling of 2123821996 in words is "two billion, one hundred twenty-three million, eight hundred twenty-one thousand, nine hundred ninety-six".