21240120299 has 2 divisors, whose sum is σ = 21240120300. Its totient is φ = 21240120298.

The previous prime is 21240120287. The next prime is 21240120323. The reversal of 21240120299 is 99202104212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21240120299 is a prime.

It is a super-2 number, since 2×21240120299² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21240120899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620060149 + 10620060150.

It is an arithmetic number, because the mean of its divisors is an integer number (10620060150).

Almost surely, 2^21240120299 is an apocalyptic number.

21240120299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240120299 is an equidigital number, since it uses as much as digits as its factorization.

21240120299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 21240120299 in words is "twenty-one billion, two hundred forty million, one hundred twenty thousand, two hundred ninety-nine".