21442299997 has 2 divisors, whose sum is σ = 21442299998. Its totient is φ = 21442299996.

The previous prime is 21442299973. The next prime is 21442300013. The reversal of 21442299997 is 79999224412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20613493476 + 828806521 = 143574^2 + 28789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21442299997 is a prime.

It is a super-2 number, since 2×21442299997² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442299947) 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, 10721149998 + 10721149999.

It is an arithmetic number, because the mean of its divisors is an integer number (10721149999).

Almost surely, 2^21442299997 is an apocalyptic number.

It is an amenable number.

21442299997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442299997 is an equidigital number, since it uses as much as digits as its factorization.

21442299997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 58.

The spelling of 21442299997 in words is "twenty-one billion, four hundred forty-two million, two hundred ninety-nine thousand, nine hundred ninety-seven".