2020101021 has 12 divisors (see below), whose sum is σ = 2954860480. Its totient is φ = 1329686280.

The previous prime is 2020100981. The next prime is 2020101023. The reversal of 2020101021 is 1201010202.

It is not a de Polignac number, because 2020101021 - 2²³ = 2011712413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2020100994 and 2020101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020101023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1419895 + ... + 1421316.

Almost surely, 2^2020101021 is an apocalyptic number.

It is an amenable number.

2020101021 is a deficient number, since it is larger than the sum of its proper divisors (934759459).

2020101021 is a wasteful number, since it uses less digits than its factorization.

2020101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841296 (or 2841293 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2020101021 is about 44945.5339383125. The cubic root of 2020101021 is about 1264.1279373403.

Adding to 2020101021 its reverse (1201010202), we get a palindrome (3221111223).

It can be divided in two parts, 2020 and 101021, that added together give a square (103041 = 321²).

The spelling of 2020101021 in words is "two billion, twenty million, one hundred one thousand, twenty-one".