2211021023521 has 2 divisors, whose sum is σ = 2211021023522. Its totient is φ = 2211021023520.

The previous prime is 2211021023509. The next prime is 2211021023537. The reversal of 2211021023521 is 1253201201122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2167266842896 + 43754180625 = 1472164^2 + 209175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211021023521 - 2¹⁵ = 2211020990753 is a prime.

It is a super-2 number, since 2×2211021023521² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2211021023492 and 2211021023501.

It is not a weakly prime, because it can be changed into another prime (2211021023921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105510511760 + 1105510511761.

It is an arithmetic number, because the mean of its divisors is an integer number (1105510511761).

Almost surely, 2^{2211021023521} is an apocalyptic number.

It is an amenable number.

2211021023521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211021023521 is an equidigital number, since it uses as much as digits as its factorization.

2211021023521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 2211021023521 its reverse (1253201201122), we get a palindrome (3464222224643).

The spelling of 2211021023521 in words is "two trillion, two hundred eleven billion, twenty-one million, twenty-three thousand, five hundred twenty-one".