212321811 has 8 divisors (see below), whose sum is σ = 304872400. Its totient is φ = 130659552.

The previous prime is 212321807. The next prime is 212321819. The reversal of 212321811 is 118123212.

212321811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 212321811 - 2² = 212321807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212321819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2722036 + ... + 2722113.

It is an arithmetic number, because the mean of its divisors is an integer number (38109050).

Almost surely, 2^212321811 is an apocalyptic number.

212321811 is a deficient number, since it is larger than the sum of its proper divisors (92550589).

212321811 is a wasteful number, since it uses less digits than its factorization.

212321811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444165.

The product of its digits is 192, while the sum is 21.

The square root of 212321811 is about 14571.2666230496. The cubic root of 212321811 is about 596.5747527897.

The spelling of 212321811 in words is "two hundred twelve million, three hundred twenty-one thousand, eight hundred eleven".