2152210021 has 8 divisors (see below), whose sum is σ = 2321128544. Its totient is φ = 1983772080.

The previous prime is 2152210019. The next prime is 2152210037. The reversal of 2152210021 is 1200122512.

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 not a de Polignac number, because 2152210021 - 2¹ = 2152210019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2152209977 and 2152210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152210001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110811 + ... + 128776.

It is an arithmetic number, because the mean of its divisors is an integer number (290141068).

Almost surely, 2^2152210021 is an apocalyptic number.

It is an amenable number.

2152210021 is a deficient number, since it is larger than the sum of its proper divisors (168918523).

2152210021 is a wasteful number, since it uses less digits than its factorization.

2152210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240291.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2152210021 is about 46391.9176258106. The cubic root of 2152210021 is about 1291.1049605636.

Adding to 2152210021 its reverse (1200122512), we get a palindrome (3352332533).

The spelling of 2152210021 in words is "two billion, one hundred fifty-two million, two hundred ten thousand, twenty-one".