81021122 has 32 divisors (see below), whose sum is σ = 150108672. Its totient is φ = 31938624.

The previous prime is 81021121. The next prime is 81021131. The reversal of 81021122 is 22112018.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81021122.

It is not an unprimeable number, because it can be changed into a prime (81021121) 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, 66188 + ... + 67400.

It is an arithmetic number, because the mean of its divisors is an integer number (4690896).

Almost surely, 2^81021122 is an apocalyptic number.

81021122 is a deficient number, since it is larger than the sum of its proper divisors (69087550).

81021122 is a wasteful number, since it uses less digits than its factorization.

81021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 81021122 is about 9001.1733679560. The cubic root of 81021122 is about 432.7124767069.

The spelling of 81021122 in words is "eighty-one million, twenty-one thousand, one hundred twenty-two".