81222010 has 8 divisors (see below), whose sum is σ = 146199636. Its totient is φ = 32488800.

The previous prime is 81222007. The next prime is 81222013. The reversal of 81222010 is 1022218.

It is an interprime number because it is at equal distance from previous prime (81222007) and next prime (81222013).

It can be written as a sum of positive squares in 2 ways, for example, as 80514729 + 707281 = 8973^2 + 841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81222013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4061091 + ... + 4061110.

Almost surely, 2^81222010 is an apocalyptic number.

81222010 is a deficient number, since it is larger than the sum of its proper divisors (64977626).

81222010 is a wasteful number, since it uses less digits than its factorization.

81222010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8122208.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 81222010 is about 9012.3254490725. The cubic root of 81222010 is about 433.0698115068.

Adding to 81222010 its reverse (1022218), we get a palindrome (82244228).

It can be divided in two parts, 812 and 22010, that added together give a palindrome (22822).

The spelling of 81222010 in words is "eighty-one million, two hundred twenty-two thousand, ten".