821241372 has 144 divisors (see below), whose sum is σ = 2442454560. Its totient is φ = 213147648.

The previous prime is 821241361. The next prime is 821241373. The reversal of 821241372 is 273142128.

It is a super-3 number, since 3×821241372³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821241373) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288468 + ... + 291300.

It is an arithmetic number, because the mean of its divisors is an integer number (16961490).

Almost surely, 2^821241372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821241372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1221227280).

821241372 is an abundant number, since it is smaller than the sum of its proper divisors (1621213188).

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

821241372 is a wasteful number, since it uses less digits than its factorization.

821241372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900 (or 2891 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 821241372 is about 28657.3092246987. The cubic root of 821241372 is about 936.4622461130.

The spelling of 821241372 in words is "eight hundred twenty-one million, two hundred forty-one thousand, three hundred seventy-two".