1921133530 has 16 divisors (see below), whose sum is σ = 3496896360. Its totient is φ = 759818752.

The previous prime is 1921133527. The next prime is 1921133531. The reversal of 1921133530 is 353311291.

It can be written as a sum of positive squares in 4 ways, for example, as 1598320441 + 322813089 = 39979^2 + 17967^2 .

It is not an unprimeable number, because it can be changed into a prime (1921133531) 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, 1078399 + ... + 1080178.

Almost surely, 2^1921133530 is an apocalyptic number.

1921133530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1921133530 is a deficient number, since it is larger than the sum of its proper divisors (1575762830).

1921133530 is a wasteful number, since it uses less digits than its factorization.

1921133530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158673.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 1921133530 is about 43830.7372742006. The cubic root of 1921133530 is about 1243.1375474062.

The spelling of 1921133530 in words is "one billion, nine hundred twenty-one million, one hundred thirty-three thousand, five hundred thirty".