81042022 has 4 divisors (see below), whose sum is σ = 121563036. Its totient is φ = 40521010.

The previous prime is 81042019. The next prime is 81042103. The reversal of 81042022 is 22024018.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20260504 + ... + 20260507.

It is an arithmetic number, because the mean of its divisors is an integer number (30390759).

Almost surely, 2^81042022 is an apocalyptic number.

81042022 is a deficient number, since it is larger than the sum of its proper divisors (40521014).

81042022 is a wasteful number, since it uses less digits than its factorization.

81042022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40521013.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 81042022 is about 9002.3342528480. The cubic root of 81042022 is about 432.7496806402.

The spelling of 81042022 in words is "eighty-one million, forty-two thousand, twenty-two".