211101007021 has 2 divisors, whose sum is σ = 211101007022. Its totient is φ = 211101007020.

The previous prime is 211101006983. The next prime is 211101007043. The reversal of 211101007021 is 120700101112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188107833796 + 22993173225 = 433714^2 + 151635^2 .

It is a cyclic number.

It is not a de Polignac number, because 211101007021 - 2⁹ = 211101006509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211101006986 and 211101007004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211101007721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105550503510 + 105550503511.

It is an arithmetic number, because the mean of its divisors is an integer number (105550503511).

Almost surely, 2^211101007021 is an apocalyptic number.

It is an amenable number.

211101007021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211101007021 is an equidigital number, since it uses as much as digits as its factorization.

211101007021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 211101007021 its reverse (120700101112), we get a palindrome (331801108133).

The spelling of 211101007021 in words is "two hundred eleven billion, one hundred one million, seven thousand, twenty-one".