81212103 has 48 divisors (see below), whose sum is σ = 143410176. Its totient is φ = 43274880.

The previous prime is 81212071. The next prime is 81212113. The reversal of 81212103 is 30121218.

It is not a de Polignac number, because 81212103 - 2⁵ = 81212071 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81212113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58726 + ... + 60092.

It is an arithmetic number, because the mean of its divisors is an integer number (2987712).

Almost surely, 2^81212103 is an apocalyptic number.

81212103 is a deficient number, since it is larger than the sum of its proper divisors (62198073).

81212103 is a wasteful number, since it uses less digits than its factorization.

81212103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444 (or 1441 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 81212103 is about 9011.7757961458. The cubic root of 81212103 is about 433.0522029913.

The spelling of 81212103 in words is "eighty-one million, two hundred twelve thousand, one hundred three".