2123621020 has 24 divisors (see below), whose sum is σ = 4471084800. Its totient is φ = 847261632.

The previous prime is 2123620991. The next prime is 2123621023. The reversal of 2123621020 is 201263212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123621023) 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, 128700 + ... + 144259.

It is an arithmetic number, because the mean of its divisors is an integer number (186295200).

Almost surely, 2^2123621020 is an apocalyptic number.

2123621020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123621020 is an abundant number, since it is smaller than the sum of its proper divisors (2347463780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2123621020 is a wasteful number, since it uses less digits than its factorization.

2123621020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273357 (or 273355 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2123621020 is about 46082.7627210001. The cubic root of 2123621020 is about 1285.3626374352.

Adding to 2123621020 its reverse (201263212), we get a palindrome (2324884232).

The spelling of 2123621020 in words is "two billion, one hundred twenty-three million, six hundred twenty-one thousand, twenty".