2689229821 has 2 divisors, whose sum is σ = 2689229822. Its totient is φ = 2689229820.

The previous prime is 2689229801. The next prime is 2689229833. The reversal of 2689229821 is 1289229862.

2689229821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2662044025 + 27185796 = 51595^2 + 5214^2 .

It is a cyclic number.

It is not a de Polignac number, because 2689229821 - 2⁷ = 2689229693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2689229801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344614910 + 1344614911.

It is an arithmetic number, because the mean of its divisors is an integer number (1344614911).

Almost surely, 2^2689229821 is an apocalyptic number.

It is an amenable number.

2689229821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2689229821 is an equidigital number, since it uses as much as digits as its factorization.

2689229821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The square root of 2689229821 is about 51857.7845747386. The cubic root of 2689229821 is about 1390.6226737669.

The spelling of 2689229821 in words is "two billion, six hundred eighty-nine million, two hundred twenty-nine thousand, eight hundred twenty-one".