211941290643487 has 2 divisors, whose sum is σ = 211941290643488. Its totient is φ = 211941290643486.

The previous prime is 211941290643457. The next prime is 211941290643499. The reversal of 211941290643487 is 784346092149112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211941290643487 - 2¹¹ = 211941290641439 is a prime.

It is a super-2 number, since 2×211941290643487² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211941290643457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105970645321743 + 105970645321744.

It is an arithmetic number, because the mean of its divisors is an integer number (105970645321744).

Almost surely, 2^{211941290643487} is an apocalyptic number.

211941290643487 is a deficient number, since it is larger than the sum of its proper divisors (1).

211941290643487 is an equidigital number, since it uses as much as digits as its factorization.

211941290643487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 211941290643487 in words is "two hundred eleven trillion, nine hundred forty-one billion, two hundred ninety million, six hundred forty-three thousand, four hundred eighty-seven".