1521821672 has 16 divisors (see below), whose sum is σ = 3261046560. Its totient is φ = 652209264.

The previous prime is 1521821671. The next prime is 1521821677. The reversal of 1521821672 is 2761281251.

It is not an unprimeable number, because it can be changed into a prime (1521821671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13587638 + ... + 13587749.

It is an arithmetic number, because the mean of its divisors is an integer number (203815410).

Almost surely, 2^1521821672 is an apocalyptic number.

It is an amenable number.

1521821672 is an abundant number, since it is smaller than the sum of its proper divisors (1739224888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1521821672 is a wasteful number, since it uses less digits than its factorization.

1521821672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27175400 (or 27175396 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 1521821672 is about 39010.5328340949. The cubic root of 1521821672 is about 1150.2385571893.

The spelling of 1521821672 in words is "one billion, five hundred twenty-one million, eight hundred twenty-one thousand, six hundred seventy-two".