2123021021 has 8 divisors (see below), whose sum is σ = 2327001888. Its totient is φ = 1920870000.

The previous prime is 2123020997. The next prime is 2123021029. The reversal of 2123021021 is 1201203212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123020987 and 2123021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123021029) 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, 455030 + ... + 459671.

It is an arithmetic number, because the mean of its divisors is an integer number (290875236).

Almost surely, 2^2123021021 is an apocalyptic number.

It is an amenable number.

2123021021 is a deficient number, since it is larger than the sum of its proper divisors (203980867).

2123021021 is a wasteful number, since it uses less digits than its factorization.

2123021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914923.

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

The square root of 2123021021 is about 46076.2522455983. The cubic root of 2123021021 is about 1285.2415723718.

Adding to 2123021021 its reverse (1201203212), we get a palindrome (3324224233).

The spelling of 2123021021 in words is "two billion, one hundred twenty-three million, twenty-one thousand, twenty-one".