21000211021007 has 2 divisors, whose sum is σ = 21000211021008. Its totient is φ = 21000211021006.

The previous prime is 21000211020961. The next prime is 21000211021037. The reversal of 21000211021007 is 70012011200012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000211021007 - 2⁸ = 21000211020751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000211021037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500105510503 + 10500105510504.

It is an arithmetic number, because the mean of its divisors is an integer number (10500105510504).

Almost surely, 2^{21000211021007} is an apocalyptic number.

21000211021007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000211021007 is an equidigital number, since it uses as much as digits as its factorization.

21000211021007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 21000211021007 its reverse (70012011200012), we get a palindrome (91012222221019).

The spelling of 21000211021007 in words is "twenty-one trillion, two hundred eleven million, twenty-one thousand, seven".