212421971 has 2 divisors, whose sum is σ = 212421972. Its totient is φ = 212421970.

The previous prime is 212421931. The next prime is 212421977. The reversal of 212421971 is 179124212.

212421971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212421971 - 2¹⁰ = 212420947 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212421977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106210985 + 106210986.

It is an arithmetic number, because the mean of its divisors is an integer number (106210986).

Almost surely, 2^212421971 is an apocalyptic number.

212421971 is a deficient number, since it is larger than the sum of its proper divisors (1).

212421971 is an equidigital number, since it uses as much as digits as its factorization.

212421971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 212421971 is about 14574.7031187603. The cubic root of 212421971 is about 596.6685467866.

The spelling of 212421971 in words is "two hundred twelve million, four hundred twenty-one thousand, nine hundred seventy-one".