2120321021 has 32 divisors (see below), whose sum is σ = 2702827008. Its totient is φ = 1618755840.

The previous prime is 2120321003. The next prime is 2120321041. The reversal of 2120321021 is 1201230212.

It is a happy number.

It is not a de Polignac number, because 2120321021 - 2⁶ = 2120320957 is a prime.

It is a super-3 number, since 3×2120321021³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 2120320987 and 2120321005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120321041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 290600 + ... + 297806.

It is an arithmetic number, because the mean of its divisors is an integer number (84463344).

Almost surely, 2^2120321021 is an apocalyptic number.

It is an amenable number.

2120321021 is a deficient number, since it is larger than the sum of its proper divisors (582505987).

2120321021 is a wasteful number, since it uses less digits than its factorization.

2120321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7341.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2120321021 is about 46046.9436662196. The cubic root of 2120321021 is about 1284.6964962228.

Adding to 2120321021 its reverse (1201230212), we get a palindrome (3321551233).

It can be divided in two parts, 21203 and 21021, that added together give a palindrome (42224).

The spelling of 2120321021 in words is "two billion, one hundred twenty million, three hundred twenty-one thousand, twenty-one".