2121737827 has 4 divisors (see below), whose sum is σ = 2314623096. Its totient is φ = 1928852560.

The previous prime is 2121737797. The next prime is 2121737831. The reversal of 2121737827 is 7287371212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121737827 - 2¹⁵ = 2121705059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121737827.

It is not an unprimeable number, because it can be changed into a prime (2121737837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96442618 + ... + 96442639.

It is an arithmetic number, because the mean of its divisors is an integer number (578655774).

Almost surely, 2^2121737827 is an apocalyptic number.

2121737827 is a deficient number, since it is larger than the sum of its proper divisors (192885269).

2121737827 is a wasteful number, since it uses less digits than its factorization.

2121737827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192885268.

The product of its digits is 65856, while the sum is 40.

The square root of 2121737827 is about 46062.3254623559. The cubic root of 2121737827 is about 1284.9825787582.

The spelling of 2121737827 in words is "two billion, one hundred twenty-one million, seven hundred thirty-seven thousand, eight hundred twenty-seven".