2821521949 has 2 divisors, whose sum is σ = 2821521950. Its totient is φ = 2821521948.

The previous prime is 2821521919. The next prime is 2821521979. The reversal of 2821521949 is 9491251282.

It is a balanced prime because it is at equal distance from previous prime (2821521919) and next prime (2821521979).

It can be written as a sum of positive squares in only one way, i.e., 2821521924 + 25 = 53118^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 2821521949 - 2¹⁷ = 2821390877 is a prime.

It is a super-2 number, since 2×2821521949² = 15921972217377517202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2821521919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410760974 + 1410760975.

It is an arithmetic number, because the mean of its divisors is an integer number (1410760975).

Almost surely, 2^2821521949 is an apocalyptic number.

It is an amenable number.

2821521949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2821521949 is an equidigital number, since it uses as much as digits as its factorization.

2821521949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 2821521949 is about 53118.0002353251. Note that the first 3 decimals coincide. The cubic root of 2821521949 is about 1413.0617619242.

The spelling of 2821521949 in words is "two billion, eight hundred twenty-one million, five hundred twenty-one thousand, nine hundred forty-nine".