212421667 has 2 divisors, whose sum is σ = 212421668. Its totient is φ = 212421666.

The previous prime is 212421617. The next prime is 212421689. The reversal of 212421667 is 766124212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212421667 is a prime.

It is a super-2 number, since 2×212421667² = 90245929222117778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212421617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106210833 + 106210834.

It is an arithmetic number, because the mean of its divisors is an integer number (106210834).

Almost surely, 2^212421667 is an apocalyptic number.

212421667 is a deficient number, since it is larger than the sum of its proper divisors (1).

212421667 is an equidigital number, since it uses as much as digits as its factorization.

212421667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 212421667 is about 14574.6926897276. The cubic root of 212421667 is about 596.6682621529.

Adding to 212421667 its reverse (766124212), we get a palindrome (978545879).

The spelling of 212421667 in words is "two hundred twelve million, four hundred twenty-one thousand, six hundred sixty-seven".