212137469 has 2 divisors, whose sum is σ = 212137470. Its totient is φ = 212137468.

The previous prime is 212137439. The next prime is 212137481. The reversal of 212137469 is 964731212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211848025 + 289444 = 14555^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 212137469 - 2¹² = 212133373 is a prime.

It is a super-2 number, since 2×212137469² = 90004611507451922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212137439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106068734 + 106068735.

It is an arithmetic number, because the mean of its divisors is an integer number (106068735).

Almost surely, 2^212137469 is an apocalyptic number.

It is an amenable number.

212137469 is a deficient number, since it is larger than the sum of its proper divisors (1).

212137469 is an equidigital number, since it uses as much as digits as its factorization.

212137469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 212137469 is about 14564.9397183785. The cubic root of 212137469 is about 596.4020501282.

It can be divided in two parts, 21213 and 7469, that added together give a palindrome (28682).

The spelling of 212137469 in words is "two hundred twelve million, one hundred thirty-seven thousand, four hundred sixty-nine".