2123011021 has 8 divisors (see below), whose sum is σ = 2232229824. Its totient is φ = 2015201760.

The previous prime is 2123011013. The next prime is 2123011069. The reversal of 2123011021 is 1201103212.

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 2123011021 - 2³ = 2123011013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123010992 and 2123011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123011081) 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, 349296 + ... + 355321.

It is an arithmetic number, because the mean of its divisors is an integer number (279028728).

Almost surely, 2^2123011021 is an apocalyptic number.

It is an amenable number.

2123011021 is a deficient number, since it is larger than the sum of its proper divisors (109218803).

2123011021 is a wasteful number, since it uses less digits than its factorization.

2123011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704771.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2123011021 is about 46076.1437297003. The cubic root of 2123011021 is about 1285.2395544241.

Adding to 2123011021 its reverse (1201103212), we get a palindrome (3324114233).

The spelling of 2123011021 in words is "two billion, one hundred twenty-three million, eleven thousand, twenty-one".