212554421 has 2 divisors, whose sum is σ = 212554422. Its totient is φ = 212554420.

The previous prime is 212554409. The next prime is 212554429. The reversal of 212554421 is 124455212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193071025 + 19483396 = 13895^2 + 4414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212554421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212554429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106277210 + 106277211.

It is an arithmetic number, because the mean of its divisors is an integer number (106277211).

Almost surely, 2^212554421 is an apocalyptic number.

It is an amenable number.

212554421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212554421 is an equidigital number, since it uses as much as digits as its factorization.

212554421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3200, while the sum is 26.

The square root of 212554421 is about 14579.2462425188. The cubic root of 212554421 is about 596.7925332225.

The spelling of 212554421 in words is "two hundred twelve million, five hundred fifty-four thousand, four hundred twenty-one".