21146004679 has 2 divisors, whose sum is σ = 21146004680. Its totient is φ = 21146004678.

The previous prime is 21146004653. The next prime is 21146004697. The reversal of 21146004679 is 97640064112.

Together with next prime (21146004697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21146004679 - 2⁹ = 21146004167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21146004619) 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, 10573002339 + 10573002340.

It is an arithmetic number, because the mean of its divisors is an integer number (10573002340).

Almost surely, 2^21146004679 is an apocalyptic number.

21146004679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146004679 is an equidigital number, since it uses as much as digits as its factorization.

21146004679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 21146004679 in words is "twenty-one billion, one hundred forty-six million, four thousand, six hundred seventy-nine".