1049721921 has 6 divisors (see below), whose sum is σ = 1516265010. Its totient is φ = 699814608.

The previous prime is 1049721917. The next prime is 1049721943. The reversal of 1049721921 is 1291279401.

1049721921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1013721921 + 36000000 = 31839^2 + 6000^2 .

It is not a de Polignac number, because 1049721921 - 2² = 1049721917 is a prime.

It is a super-2 number, since 2×1049721921² = 2203832222855860482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1049721971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58317876 + ... + 58317893.

It is an arithmetic number, because the mean of its divisors is an integer number (252710835).

Almost surely, 2^1049721921 is an apocalyptic number.

It is an amenable number.

1049721921 is a deficient number, since it is larger than the sum of its proper divisors (466543089).

1049721921 is a wasteful number, since it uses less digits than its factorization.

1049721921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116635775 (or 116635772 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1049721921 is about 32399.4123557820. The cubic root of 1049721921 is about 1016.3066223903.

The spelling of 1049721921 in words is "one billion, forty-nine million, seven hundred twenty-one thousand, nine hundred twenty-one".