821412270 has 192 divisors, whose sum is σ = 2546159616. Its totient is φ = 179781120.

The previous prime is 821412253. The next prime is 821412283. The reversal of 821412270 is 72214128.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2675457 + ... + 2675763.

It is an arithmetic number, because the mean of its divisors is an integer number (13261248).

Almost surely, 2^821412270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821412270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273079808).

821412270 is an abundant number, since it is smaller than the sum of its proper divisors (1724747346).

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

821412270 is a wasteful number, since it uses less digits than its factorization.

821412270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 821412270 is about 28660.2908219718. The cubic root of 821412270 is about 936.5271999866.

Adding to 821412270 its reverse (72214128), we get a palindrome (893626398).

The spelling of 821412270 in words is "eight hundred twenty-one million, four hundred twelve thousand, two hundred seventy".