21442023394147 has 2 divisors, whose sum is σ = 21442023394148. Its totient is φ = 21442023394146.

The previous prime is 21442023394109. The next prime is 21442023394201. The reversal of 21442023394147 is 74149332024412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21442023394147 - 2³¹ = 21439875910499 is a prime.

It is a super-2 number, since 2×21442023394147² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21442023394097 and 21442023394106.

It is not a weakly prime, because it can be changed into another prime (21442023391147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721011697073 + 10721011697074.

It is an arithmetic number, because the mean of its divisors is an integer number (10721011697074).

Almost surely, 2^{21442023394147} is an apocalyptic number.

21442023394147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442023394147 is an equidigital number, since it uses as much as digits as its factorization.

21442023394147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 21442023394147 in words is "twenty-one trillion, four hundred forty-two billion, twenty-three million, three hundred ninety-four thousand, one hundred forty-seven".