21906346524743 has 2 divisors, whose sum is σ = 21906346524744. Its totient is φ = 21906346524742.

The previous prime is 21906346524739. The next prime is 21906346524787. The reversal of 21906346524743 is 34742564360912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21906346524743 - 2² = 21906346524739 is a prime.

It is a super-2 number, since 2×21906346524743² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21906346520743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10953173262371 + 10953173262372.

It is an arithmetic number, because the mean of its divisors is an integer number (10953173262372).

Almost surely, 2^{21906346524743} is an apocalyptic number.

21906346524743 is a deficient number, since it is larger than the sum of its proper divisors (1).

21906346524743 is an equidigital number, since it uses as much as digits as its factorization.

21906346524743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 21906346524743 in words is "twenty-one trillion, nine hundred six billion, three hundred forty-six million, five hundred twenty-four thousand, seven hundred forty-three".