21011344499 has 2 divisors, whose sum is σ = 21011344500. Its totient is φ = 21011344498.

The previous prime is 21011344483. The next prime is 21011344559. The reversal of 21011344499 is 99444311012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011344499 - 2⁴ = 21011344483 is a prime.

It is a super-2 number, since 2×21011344499² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21011344469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505672249 + 10505672250.

It is an arithmetic number, because the mean of its divisors is an integer number (10505672250).

Almost surely, 2^21011344499 is an apocalyptic number.

21011344499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011344499 is an equidigital number, since it uses as much as digits as its factorization.

21011344499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 21011344499 in words is "twenty-one billion, eleven million, three hundred forty-four thousand, four hundred ninety-nine".