21101021927 has 2 divisors, whose sum is σ = 21101021928. Its totient is φ = 21101021926.

The previous prime is 21101021923. The next prime is 21101021971. The reversal of 21101021927 is 72912010112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101021927 - 2² = 21101021923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101021896 and 21101021905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101021923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550510963 + 10550510964.

It is an arithmetic number, because the mean of its divisors is an integer number (10550510964).

Almost surely, 2^21101021927 is an apocalyptic number.

21101021927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101021927 is an equidigital number, since it uses as much as digits as its factorization.

21101021927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The spelling of 21101021927 in words is "twenty-one billion, one hundred one million, twenty-one thousand, nine hundred twenty-seven".