821061252 has 48 divisors (see below), whose sum is σ = 2322196800. Its totient is φ = 248806080.

The previous prime is 821061217. The next prime is 821061259. The reversal of 821061252 is 252160128.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (821061259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344377 + ... + 346752.

It is an arithmetic number, because the mean of its divisors is an integer number (48379100).

Almost surely, 2^821061252 is an apocalyptic number.

It is an amenable number.

821061252 is an abundant number, since it is smaller than the sum of its proper divisors (1501135548).

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

821061252 is a wasteful number, since it uses less digits than its factorization.

821061252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691153 (or 691145 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 821061252 is about 28654.1663986234. The cubic root of 821061252 is about 936.3937774432.

The spelling of 821061252 in words is "eight hundred twenty-one million, sixty-one thousand, two hundred fifty-two".