212139777 has 8 divisors (see below), whose sum is σ = 286031520. Its totient is φ = 139837280.

The previous prime is 212139709. The next prime is 212139791. The reversal of 212139777 is 777931212.

212139777 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 a cyclic number.

It is not a de Polignac number, because 212139777 - 2¹⁴ = 212123393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212139077) 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, 396999 + ... + 397532.

It is an arithmetic number, because the mean of its divisors is an integer number (35753940).

Almost surely, 2^212139777 is an apocalyptic number.

It is an amenable number.

212139777 is a deficient number, since it is larger than the sum of its proper divisors (73891743).

212139777 is an equidigital number, since it uses as much as digits as its factorization.

212139777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794623.

The product of its digits is 37044, while the sum is 39.

The square root of 212139777 is about 14565.0189495242. The cubic root of 212139777 is about 596.4042130196.

The spelling of 212139777 in words is "two hundred twelve million, one hundred thirty-nine thousand, seven hundred seventy-seven".