213129979 has 2 divisors, whose sum is σ = 213129980. Its totient is φ = 213129978.

The previous prime is 213129977. The next prime is 213130031. The reversal of 213129979 is 979921312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213129979 - 2¹ = 213129977 is a prime.

Together with 213129977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213129977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106564989 + 106564990.

It is an arithmetic number, because the mean of its divisors is an integer number (106564990).

Almost surely, 2^213129979 is an apocalyptic number.

213129979 is a deficient number, since it is larger than the sum of its proper divisors (1).

213129979 is an equidigital number, since it uses as much as digits as its factorization.

213129979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 213129979 is about 14598.9718473597. The cubic root of 213129979 is about 597.3307156264.

The spelling of 213129979 in words is "two hundred thirteen million, one hundred twenty-nine thousand, nine hundred seventy-nine".