2101920530 has 16 divisors (see below), whose sum is σ = 3792714840. Its totient is φ = 838710912.

The previous prime is 2101920521. The next prime is 2101920533. The reversal of 2101920530 is 350291012.

It can be written as a sum of positive squares in 4 ways, for example, as 2100663889 + 1256641 = 45833^2 + 1121^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2101920496 and 2101920505.

It is not an unprimeable number, because it can be changed into a prime (2101920533) 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, 252869 + ... + 261048.

Almost surely, 2^2101920530 is an apocalyptic number.

2101920530 is a deficient number, since it is larger than the sum of its proper divisors (1690794310).

2101920530 is a wasteful number, since it uses less digits than its factorization.

2101920530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514333.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 2101920530 is about 45846.7068610167. The cubic root of 2101920530 is about 1280.9694255191.

The spelling of 2101920530 in words is "two billion, one hundred one million, nine hundred twenty thousand, five hundred thirty".