21015101211007 has 2 divisors, whose sum is σ = 21015101211008. Its totient is φ = 21015101211006.

The previous prime is 21015101210977. The next prime is 21015101211017. The reversal of 21015101211007 is 70011210151012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21015101211007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21015101211017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507550605503 + 10507550605504.

It is an arithmetic number, because the mean of its divisors is an integer number (10507550605504).

Almost surely, 2^{21015101211007} is an apocalyptic number.

21015101211007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21015101211007 is an equidigital number, since it uses as much as digits as its factorization.

21015101211007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 22.

Adding to 21015101211007 its reverse (70011210151012), we get a palindrome (91026311362019).

The spelling of 21015101211007 in words is "twenty-one trillion, fifteen billion, one hundred one million, two hundred eleven thousand, seven".