212777139 has 16 divisors (see below), whose sum is σ = 290565792. Its totient is φ = 138448128.

The previous prime is 212777129. The next prime is 212777141. The reversal of 212777139 is 931777212.

It is not a de Polignac number, because 212777139 - 2⁵ = 212777107 is a prime.

It is a super-2 number, since 2×212777139² = 90548221762050642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212777097 and 212777106.

It is not an unprimeable number, because it can be changed into a prime (212777129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27927 + ... + 34719.

It is an arithmetic number, because the mean of its divisors is an integer number (18160362).

Almost surely, 2^212777139 is an apocalyptic number.

212777139 is a deficient number, since it is larger than the sum of its proper divisors (77788653).

212777139 is a wasteful number, since it uses less digits than its factorization.

212777139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046.

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

The square root of 212777139 is about 14586.8824290868. The cubic root of 212777139 is about 597.0009034551. Note that the first 3 decimals are identical.

The spelling of 212777139 in words is "two hundred twelve million, seven hundred seventy-seven thousand, one hundred thirty-nine".