2020120021 has 8 divisors (see below), whose sum is σ = 2049721560. Its totient is φ = 1990570752.

The previous prime is 2020120007. The next prime is 2020120027. The reversal of 2020120021 is 1200210202.

It can be written as a sum of positive squares in 4 ways, for example, as 91680625 + 1928439396 = 9575^2 + 43914^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2020120021 - 2²¹ = 2018022869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020120027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68481 + ... + 93433.

It is an arithmetic number, because the mean of its divisors is an integer number (256215195).

Almost surely, 2^2020120021 is an apocalyptic number.

It is an amenable number.

2020120021 is a deficient number, since it is larger than the sum of its proper divisors (29601539).

2020120021 is a wasteful number, since it uses less digits than its factorization.

2020120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26135.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2020120021 is about 44945.7453047560. The cubic root of 2020120021 is about 1264.1319005671.

Adding to 2020120021 its reverse (1200210202), we get a palindrome (3220330223).

The spelling of 2020120021 in words is "two billion, twenty million, one hundred twenty thousand, twenty-one".