212421977 has 2 divisors, whose sum is σ = 212421978. Its totient is φ = 212421976.

The previous prime is 212421971. The next prime is 212422051. The reversal of 212421977 is 779124212.

212421977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124456336 + 87965641 = 11156^2 + 9379^2 .

It is a cyclic number.

It is not a de Polignac number, because 212421977 - 2²⁰ = 211373401 is a prime.

It is not a weakly prime, because it can be changed into another prime (212421971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106210988 + 106210989.

It is an arithmetic number, because the mean of its divisors is an integer number (106210989).

Almost surely, 2^212421977 is an apocalyptic number.

It is an amenable number.

212421977 is a deficient number, since it is larger than the sum of its proper divisors (1).

212421977 is an equidigital number, since it uses as much as digits as its factorization.

212421977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 212421977 is about 14574.7033245964. The cubic root of 212421977 is about 596.6685524043.

The spelling of 212421977 in words is "two hundred twelve million, four hundred twenty-one thousand, nine hundred seventy-seven".