2120220021 has 8 divisors (see below), whose sum is σ = 2835061600. Its totient is φ = 1409429232.

The previous prime is 2120219989. The next prime is 2120220023. The reversal of 2120220021 is 1200220212.

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

It is not a de Polignac number, because 2120220021 - 2⁵ = 2120219989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120219979 and 2120220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120220023) 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, 1011475 + ... + 1013568.

It is an arithmetic number, because the mean of its divisors is an integer number (354382700).

Almost surely, 2^2120220021 is an apocalyptic number.

It is an amenable number.

2120220021 is a deficient number, since it is larger than the sum of its proper divisors (714841579).

2120220021 is a wasteful number, since it uses less digits than its factorization.

2120220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025395.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2120220021 is about 46045.8469462774. The cubic root of 2120220021 is about 1284.6760973610.

Adding to 2120220021 its reverse (1200220212), we get a palindrome (3320440233).

The spelling of 2120220021 in words is "two billion, one hundred twenty million, two hundred twenty thousand, twenty-one".