81422212 has 6 divisors (see below), whose sum is σ = 142488878. Its totient is φ = 40711104.

The previous prime is 81422207. The next prime is 81422291. The reversal of 81422212 is 21222418.

It can be written as a sum of positive squares in only one way, i.e., 81288256 + 133956 = 9016^2 + 366^2 .

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, 10177773 + ... + 10177780.

Almost surely, 2^81422212 is an apocalyptic number.

It is an amenable number.

81422212 is a deficient number, since it is larger than the sum of its proper divisors (61066666).

81422212 is a wasteful number, since it uses less digits than its factorization.

81422212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20355557 (or 20355555 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 81422212 is about 9023.4257352737. The cubic root of 81422212 is about 433.4253403581.

The spelling of 81422212 in words is "eighty-one million, four hundred twenty-two thousand, two hundred twelve".