21021003827 has 2 divisors, whose sum is σ = 21021003828. Its totient is φ = 21021003826.

The previous prime is 21021003823. The next prime is 21021003877. The reversal of 21021003827 is 72830012012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021003827 - 2² = 21021003823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021003796 and 21021003805.

It is not a weakly prime, because it can be changed into another prime (21021003823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510501913 + 10510501914.

It is an arithmetic number, because the mean of its divisors is an integer number (10510501914).

Almost surely, 2^21021003827 is an apocalyptic number.

21021003827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021003827 is an equidigital number, since it uses as much as digits as its factorization.

21021003827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21021003827 its reverse (72830012012), we get a palindrome (93851015839).

The spelling of 21021003827 in words is "twenty-one billion, twenty-one million, three thousand, eight hundred twenty-seven".