2020421091 has 16 divisors (see below), whose sum is σ = 2968587776. Its totient is φ = 1214420256.

The previous prime is 2020421089. The next prime is 2020421099. The reversal of 2020421091 is 1901240202.

It is not a de Polignac number, because 2020421091 - 2¹ = 2020421089 is a prime.

It is a super-3 number, since 3×2020421091³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020421099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 600715 + ... + 604068.

It is an arithmetic number, because the mean of its divisors is an integer number (185536736).

Almost surely, 2^2020421091 is an apocalyptic number.

2020421091 is a deficient number, since it is larger than the sum of its proper divisors (948166685).

2020421091 is a wasteful number, since it uses less digits than its factorization.

2020421091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204842.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2020421091 is about 44949.0944402665. The cubic root of 2020421091 is about 1264.1946977081.

Adding to 2020421091 its reverse (1901240202), we get a palindrome (3921661293).

Subtracting from 2020421091 its reverse (1901240202), we obtain a square (119180889 = 10917²).

The spelling of 2020421091 in words is "two billion, twenty million, four hundred twenty-one thousand, ninety-one".