21890124467 has 2 divisors, whose sum is σ = 21890124468. Its totient is φ = 21890124466.

The previous prime is 21890124419. The next prime is 21890124469. The reversal of 21890124467 is 76442109812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21890124467 - 2⁸ = 21890124211 is a prime.

It is a super-4 number, since 4×21890124467⁴ (a number of 42 digits) contains 4444 as substring.

Together with 21890124469, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21890124469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10945062233 + 10945062234.

It is an arithmetic number, because the mean of its divisors is an integer number (10945062234).

Almost surely, 2^21890124467 is an apocalyptic number.

21890124467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21890124467 is an equidigital number, since it uses as much as digits as its factorization.

21890124467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 21890124467 in words is "twenty-one billion, eight hundred ninety million, one hundred twenty-four thousand, four hundred sixty-seven".