21887827699 has 2 divisors, whose sum is σ = 21887827700. Its totient is φ = 21887827698.

The previous prime is 21887827697. The next prime is 21887827721. The reversal of 21887827699 is 99672878812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21887827699 - 2¹ = 21887827697 is a prime.

It is a super-2 number, since 2×21887827699² (a number of 21 digits) contains 22 as substring.

Together with 21887827697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21887827697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10943913849 + 10943913850.

It is an arithmetic number, because the mean of its divisors is an integer number (10943913850).

Almost surely, 2^21887827699 is an apocalyptic number.

21887827699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21887827699 is an equidigital number, since it uses as much as digits as its factorization.

21887827699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 67.

The spelling of 21887827699 in words is "twenty-one billion, eight hundred eighty-seven million, eight hundred twenty-seven thousand, six hundred ninety-nine".