811210122 has 24 divisors (see below), whose sum is σ = 1758723876. Its totient is φ = 270233856.

The previous prime is 811210117. The next prime is 811210123. The reversal of 811210122 is 221012118.

It can be written as a sum of positive squares in 2 ways, for example, as 753008481 + 58201641 = 27441^2 + 7629^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 811210095 and 811210104.

It is not an unprimeable number, because it can be changed into a prime (811210123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17268 + ... + 43824.

Almost surely, 2^811210122 is an apocalyptic number.

811210122 is an abundant number, since it is smaller than the sum of its proper divisors (947513754).

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

811210122 is a wasteful number, since it uses less digits than its factorization.

811210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28262 (or 28259 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 811210122 is about 28481.7506835517. The cubic root of 811210122 is about 932.6337344343.

The spelling of 811210122 in words is "eight hundred eleven million, two hundred ten thousand, one hundred twenty-two".