81222124 has 12 divisors (see below), whose sum is σ = 150499944. Its totient is φ = 38222144.

The previous prime is 81222103. The next prime is 81222133. The reversal of 81222124 is 42122218.

It is a junction number, because it is equal to n+sod(n) for n = 81222095 and 81222104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597154 + ... + 597289.

It is an arithmetic number, because the mean of its divisors is an integer number (12541662).

Almost surely, 2^81222124 is an apocalyptic number.

It is an amenable number.

81222124 is a deficient number, since it is larger than the sum of its proper divisors (69277820).

81222124 is a wasteful number, since it uses less digits than its factorization.

81222124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194464 (or 1194462 counting only the distinct ones).

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

The square root of 81222124 is about 9012.3317737420. The cubic root of 81222124 is about 433.0700141199.

The spelling of 81222124 in words is "eighty-one million, two hundred twenty-two thousand, one hundred twenty-four".