212401621291 has 2 divisors, whose sum is σ = 212401621292. Its totient is φ = 212401621290.

The previous prime is 212401621259. The next prime is 212401621303. The reversal of 212401621291 is 192126104212.

212401621291 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 212401621291 - 2⁵ = 212401621259 is a prime.

It is a super-2 number, since 2×212401621291² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212401624291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106200810645 + 106200810646.

It is an arithmetic number, because the mean of its divisors is an integer number (106200810646).

Almost surely, 2^212401621291 is an apocalyptic number.

212401621291 is a deficient number, since it is larger than the sum of its proper divisors (1).

212401621291 is an equidigital number, since it uses as much as digits as its factorization.

212401621291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 212401621291 in words is "two hundred twelve billion, four hundred one million, six hundred twenty-one thousand, two hundred ninety-one".