212117953 has 2 divisors, whose sum is σ = 212117954. Its totient is φ = 212117952.

The previous prime is 212117947. The next prime is 212117963. The reversal of 212117953 is 359711212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148644864 + 63473089 = 12192^2 + 7967^2 .

It is a cyclic number.

It is not a de Polignac number, because 212117953 - 2⁹ = 212117441 is a prime.

It is not a weakly prime, because it can be changed into another prime (212117963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106058976 + 106058977.

It is an arithmetic number, because the mean of its divisors is an integer number (106058977).

Almost surely, 2^212117953 is an apocalyptic number.

It is an amenable number.

212117953 is a deficient number, since it is larger than the sum of its proper divisors (1).

212117953 is an equidigital number, since it uses as much as digits as its factorization.

212117953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 212117953 is about 14564.2697379580. The cubic root of 212117953 is about 596.3837605109.

The spelling of 212117953 in words is "two hundred twelve million, one hundred seventeen thousand, nine hundred fifty-three".