212021181802 has 8 divisors (see below), whose sum is σ = 318048149700. Its totient is φ = 106005131904.

The previous prime is 212021181793. The next prime is 212021181809. The reversal of 212021181802 is 208181120212.

It can be written as a sum of positive squares in 2 ways, for example, as 211921201801 + 99980001 = 460349^2 + 9999^2 .

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 (212021181809) 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, 2680777 + ... + 2758732.

Almost surely, 2^212021181802 is an apocalyptic number.

212021181802 is a deficient number, since it is larger than the sum of its proper divisors (106026967898).

212021181802 is a wasteful number, since it uses less digits than its factorization.

212021181802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459000.

The product of its (nonzero) digits is 1024, while the sum is 28.

The spelling of 212021181802 in words is "two hundred twelve billion, twenty-one million, one hundred eighty-one thousand, eight hundred two".