2154621020 has 12 divisors (see below), whose sum is σ = 4524704184. Its totient is φ = 861848400.

The previous prime is 2154621019. The next prime is 2154621043. The reversal of 2154621020 is 201264512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53865506 + ... + 53865545.

It is an arithmetic number, because the mean of its divisors is an integer number (377058682).

Almost surely, 2^2154621020 is an apocalyptic number.

2154621020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154621020 is an abundant number, since it is smaller than the sum of its proper divisors (2370083164).

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

2154621020 is a wasteful number, since it uses less digits than its factorization.

2154621020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107731060 (or 107731058 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2154621020 is about 46417.8954714666. The cubic root of 2154621020 is about 1291.5868979019.

Adding to 2154621020 its reverse (201264512), we get a palindrome (2355885532).

The spelling of 2154621020 in words is "two billion, one hundred fifty-four million, six hundred twenty-one thousand, twenty".