1022220212521 has 4 divisors (see below), whose sum is σ = 1022292351172. Its totient is φ = 1022148073872.

The previous prime is 1022220212509. The next prime is 1022220212537. The reversal of 1022220212521 is 1252120222201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 896203022400 + 126017190121 = 946680^2 + 354989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022220212521 - 2⁹ = 1022220212009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022220212492 and 1022220212501.

It is not an unprimeable number, because it can be changed into a prime (1022220212921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36048066 + ... + 36076411.

It is an arithmetic number, because the mean of its divisors is an integer number (255573087793).

Almost surely, 2^{1022220212521} is an apocalyptic number.

It is an amenable number.

1022220212521 is a deficient number, since it is larger than the sum of its proper divisors (72138651).

1022220212521 is an equidigital number, since it uses as much as digits as its factorization.

1022220212521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72138650.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 1022220212521 its reverse (1252120222201), we get a palindrome (2274340434722).

The spelling of 1022220212521 in words is "one trillion, twenty-two billion, two hundred twenty million, two hundred twelve thousand, five hundred twenty-one".