1530019821 has 16 divisors (see below), whose sum is σ = 2342615040. Its totient is φ = 878479920.

The previous prime is 1530019817. The next prime is 1530019831. The reversal of 1530019821 is 1289100351.

It is not a de Polignac number, because 1530019821 - 2² = 1530019817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530019831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1219485 + ... + 1220738.

It is an arithmetic number, because the mean of its divisors is an integer number (146413440).

Almost surely, 2^1530019821 is an apocalyptic number.

1530019821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1530019821 is a deficient number, since it is larger than the sum of its proper divisors (812595219).

1530019821 is a wasteful number, since it uses less digits than its factorization.

1530019821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440256.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1530019821 is about 39115.4677972794. The cubic root of 1530019821 is about 1152.3003284474.

The spelling of 1530019821 in words is "one billion, five hundred thirty million, nineteen thousand, eight hundred twenty-one".