211421004481 has 2 divisors, whose sum is σ = 211421004482. Its totient is φ = 211421004480.

The previous prime is 211421004329. The next prime is 211421004499. The reversal of 211421004481 is 184400124112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180659001600 + 30762002881 = 425040^2 + 175391^2 .

It is a cyclic number.

It is not a de Polignac number, because 211421004481 - 2¹⁷ = 211420873409 is a prime.

It is a super-2 number, since 2×211421004481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211421004581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105710502240 + 105710502241.

It is an arithmetic number, because the mean of its divisors is an integer number (105710502241).

Almost surely, 2^211421004481 is an apocalyptic number.

It is an amenable number.

211421004481 is a deficient number, since it is larger than the sum of its proper divisors (1).

211421004481 is an equidigital number, since it uses as much as digits as its factorization.

211421004481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 28.

Adding to 211421004481 its reverse (184400124112), we get a palindrome (395821128593).

The spelling of 211421004481 in words is "two hundred eleven billion, four hundred twenty-one million, four thousand, four hundred eighty-one".