212891101 has 2 divisors, whose sum is σ = 212891102. Its totient is φ = 212891100.

The previous prime is 212891033. The next prime is 212891179. The reversal of 212891101 is 101198212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120231225 + 92659876 = 10965^2 + 9626^2 .

It is a cyclic number.

It is not a de Polignac number, because 212891101 - 2⁷ = 212890973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212891201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106445550 + 106445551.

It is an arithmetic number, because the mean of its divisors is an integer number (106445551).

Almost surely, 2^212891101 is an apocalyptic number.

It is an amenable number.

212891101 is a deficient number, since it is larger than the sum of its proper divisors (1).

212891101 is an equidigital number, since it uses as much as digits as its factorization.

212891101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 212891101 is about 14590.7882240817. The cubic root of 212891101 is about 597.1074676509.

The spelling of 212891101 in words is "two hundred twelve million, eight hundred ninety-one thousand, one hundred one".