212278448021 has 8 divisors (see below), whose sum is σ = 213609691680. Its totient is φ = 210947557392.

The previous prime is 212278447991. The next prime is 212278448117. The reversal of 212278448021 is 120844872212.

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

It is a cyclic number.

It is not a de Polignac number, because 212278448021 - 2¹⁰ = 212278446997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212278448021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212278448321) 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, 1174535 + ... + 1343163.

It is an arithmetic number, because the mean of its divisors is an integer number (26701211460).

Almost surely, 2^212278448021 is an apocalyptic number.

It is an amenable number.

212278448021 is a deficient number, since it is larger than the sum of its proper divisors (1331243659).

212278448021 is a wasteful number, since it uses less digits than its factorization.

212278448021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176515.

The product of its (nonzero) digits is 114688, while the sum is 41.

The spelling of 212278448021 in words is "two hundred twelve billion, two hundred seventy-eight million, four hundred forty-eight thousand, twenty-one".