11048020821 has 6 divisors (see below), whose sum is σ = 15958252310. Its totient is φ = 7365347208.

The previous prime is 11048020807. The next prime is 11048020849. The reversal of 11048020821 is 12802084011.

It can be written as a sum of positive squares in only one way, i.e., 11031300900 + 16719921 = 105030^2 + 4089^2 .

It is not a de Polignac number, because 11048020821 - 2⁷ = 11048020693 is a prime.

It is a super-2 number, since 2×11048020821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11048020861) 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, 613778926 + ... + 613778943.

Almost surely, 2^11048020821 is an apocalyptic number.

It is an amenable number.

11048020821 is a deficient number, since it is larger than the sum of its proper divisors (4910231489).

11048020821 is a wasteful number, since it uses less digits than its factorization.

11048020821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227557875 (or 1227557872 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The spelling of 11048020821 in words is "eleven billion, forty-eight million, twenty thousand, eight hundred twenty-one".