81212214002 has 4 divisors (see below), whose sum is σ = 121818321006. Its totient is φ = 40606107000.

The previous prime is 81212213983. The next prime is 81212214029. The reversal of 81212214002 is 20041221218.

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

It can be written as a sum of positive squares in only one way, i.e., 81002282881 + 209931121 = 284609^2 + 14489^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20303053499 + ... + 20303053502.

Almost surely, 2^81212214002 is an apocalyptic number.

81212214002 is a deficient number, since it is larger than the sum of its proper divisors (40606107004).

81212214002 is a wasteful number, since it uses less digits than its factorization.

81212214002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40606107003.

The product of its (nonzero) digits is 512, while the sum is 23.

The spelling of 81212214002 in words is "eighty-one billion, two hundred twelve million, two hundred fourteen thousand, two".