212121487 has 2 divisors, whose sum is σ = 212121488. Its totient is φ = 212121486.

The previous prime is 212121473. The next prime is 212121509. The reversal of 212121487 is 784121212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212121487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212128487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060743 + 106060744.

It is an arithmetic number, because the mean of its divisors is an integer number (106060744).

Almost surely, 2^212121487 is an apocalyptic number.

212121487 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121487 is an equidigital number, since it uses as much as digits as its factorization.

212121487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 28.

The square root of 212121487 is about 14564.3910617643. The cubic root of 212121487 is about 596.3870725180.

Adding to 212121487 its reverse (784121212), we get a palindrome (996242699).

The spelling of 212121487 in words is "two hundred twelve million, one hundred twenty-one thousand, four hundred eighty-seven".