212210021986 has 8 divisors (see below), whose sum is σ = 318483548460. Its totient is φ = 106048839168.

The previous prime is 212210021977. The next prime is 212210022097. The reversal of 212210021986 is 689120012212.

It can be written as a sum of positive squares in 2 ways, for example, as 183853145961 + 28356876025 = 428781^2 + 168395^2 .

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

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, 28081191 + ... + 28088746.

Almost surely, 2^212210021986 is an apocalyptic number.

212210021986 is a deficient number, since it is larger than the sum of its proper divisors (106273526474).

212210021986 is a wasteful number, since it uses less digits than its factorization.

212210021986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56171828.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 212210021986 in words is "two hundred twelve billion, two hundred ten million, twenty-one thousand, nine hundred eighty-six".