821720150 has 12 divisors (see below), whose sum is σ = 1528399572. Its totient is φ = 328688040.

The previous prime is 821720111. The next prime is 821720171. The reversal of 821720150 is 51027128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8217152 + ... + 8217251.

It is an arithmetic number, because the mean of its divisors is an integer number (127366631).

Almost surely, 2^821720150 is an apocalyptic number.

821720150 is a deficient number, since it is larger than the sum of its proper divisors (706679422).

821720150 is a wasteful number, since it uses less digits than its factorization.

821720150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16434415 (or 16434410 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 821720150 is about 28665.6615133857. The cubic root of 821720150 is about 936.6441944150.

Adding to 821720150 its reverse (51027128), we get a palindrome (872747278).

The spelling of 821720150 in words is "eight hundred twenty-one million, seven hundred twenty thousand, one hundred fifty".