21021310001 has 2 divisors, whose sum is σ = 21021310002. Its totient is φ = 21021310000.

The previous prime is 21021309941. The next prime is 21021310007. The reversal of 21021310001 is 10001312012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13531272976 + 7490037025 = 116324^2 + 86545^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021310001 - 2⁶ = 21021309937 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021310007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510655000 + 10510655001.

It is an arithmetic number, because the mean of its divisors is an integer number (10510655001).

Almost surely, 2^21021310001 is an apocalyptic number.

It is an amenable number.

21021310001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021310001 is an equidigital number, since it uses as much as digits as its factorization.

21021310001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21021310001 its reverse (10001312012), we get a palindrome (31022622013).

The spelling of 21021310001 in words is "twenty-one billion, twenty-one million, three hundred ten thousand, one".