212767421 has 2 divisors, whose sum is σ = 212767422. Its totient is φ = 212767420.

The previous prime is 212767369. The next prime is 212767441. The reversal of 212767421 is 124767212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200788900 + 11978521 = 14170^2 + 3461^2 .

It is a cyclic number.

It is not a de Polignac number, because 212767421 - 2²² = 208573117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212767441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106383710 + 106383711.

It is an arithmetic number, because the mean of its divisors is an integer number (106383711).

Almost surely, 2^212767421 is an apocalyptic number.

It is an amenable number.

212767421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212767421 is an equidigital number, since it uses as much as digits as its factorization.

212767421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 212767421 is about 14586.5493177790. The cubic root of 212767421 is about 596.9918145352.

The spelling of 212767421 in words is "two hundred twelve million, seven hundred sixty-seven thousand, four hundred twenty-one".