821353542 has 8 divisors (see below), whose sum is σ = 1642707096. Its totient is φ = 273784512.

The previous prime is 821353541. The next prime is 821353543. The reversal of 821353542 is 245353128.

821353542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (821353541) and next prime (821353543).

It is a sphenic number, since it is the product of 3 distinct primes.

821353542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821353541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68446123 + ... + 68446134.

It is an arithmetic number, because the mean of its divisors is an integer number (205338387).

Almost surely, 2^821353542 is an apocalyptic number.

821353542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

821353542 is a wasteful number, since it uses less digits than its factorization.

821353542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136892262.

The product of its digits is 28800, while the sum is 33.

The square root of 821353542 is about 28659.2662502026. The cubic root of 821353542 is about 936.5048800213.

The spelling of 821353542 in words is "eight hundred twenty-one million, three hundred fifty-three thousand, five hundred forty-two".