2120021507 has 2 divisors, whose sum is σ = 2120021508. Its totient is φ = 2120021506.

The previous prime is 2120021489. The next prime is 2120021581. The reversal of 2120021507 is 7051200212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2120021507 - 2¹² = 2120017411 is a prime.

It is not a weakly prime, because it can be changed into another prime (2120021107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060010753 + 1060010754.

It is an arithmetic number, because the mean of its divisors is an integer number (1060010754).

Almost surely, 2^2120021507 is an apocalyptic number.

2120021507 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120021507 is an equidigital number, since it uses as much as digits as its factorization.

2120021507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 2120021507 is about 46043.6912833887. The cubic root of 2120021507 is about 1284.6360018130.

Adding to 2120021507 its reverse (7051200212), we get a palindrome (9171221719).

The spelling of 2120021507 in words is "two billion, one hundred twenty million, twenty-one thousand, five hundred seven".