2150020021 has 2 divisors, whose sum is σ = 2150020022. Its totient is φ = 2150020020.

The previous prime is 2150020007. The next prime is 2150020057. The reversal of 2150020021 is 1200200512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2115080100 + 34939921 = 45990^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2150020021 - 2²³ = 2141631413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2150019983 and 2150020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2150020001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075010010 + 1075010011.

It is an arithmetic number, because the mean of its divisors is an integer number (1075010011).

Almost surely, 2^2150020021 is an apocalyptic number.

It is an amenable number.

2150020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2150020021 is an equidigital number, since it uses as much as digits as its factorization.

2150020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 2150020021 is about 46368.3083689712. The cubic root of 2150020021 is about 1290.6668869192. Note that the first 3 decimals are identical.

Adding to 2150020021 its reverse (1200200512), we get a palindrome (3350220533).

The spelling of 2150020021 in words is "two billion, one hundred fifty million, twenty thousand, twenty-one".