2055021021 has 6 divisors (see below), whose sum is σ = 2968363710. Its totient is φ = 1370014008.

The previous prime is 2055020977. The next prime is 2055021037. The reversal of 2055021021 is 1201205502.

It can be written as a sum of positive squares in only one way, i.e., 1570536900 + 484484121 = 39630^2 + 22011^2 .

It is not a de Polignac number, because 2055021021 - 2⁷ = 2055020893 is a prime.

It is a super-2 number, since 2×2055021021² = 8446222793503764882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2055020985 and 2055021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2055021121) 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 5 ways as a sum of consecutive naturals, for example, 114167826 + ... + 114167843.

It is an arithmetic number, because the mean of its divisors is an integer number (494727285).

Almost surely, 2^2055021021 is an apocalyptic number.

It is an amenable number.

2055021021 is a deficient number, since it is larger than the sum of its proper divisors (913342689).

2055021021 is a wasteful number, since it uses less digits than its factorization.

2055021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228335675 (or 228335672 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2055021021 is about 45332.3396815121. The cubic root of 2055021021 is about 1271.3703811887.

Adding to 2055021021 its reverse (1201205502), we get a palindrome (3256226523).

The spelling of 2055021021 in words is "two billion, fifty-five million, twenty-one thousand, twenty-one".