1221021010522 has 16 divisors (see below), whose sum is σ = 1909486133280. Its totient is φ = 585061403472.

The previous prime is 1221021010463. The next prime is 1221021010543. The reversal of 1221021010522 is 2250101201221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221021010522.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133938072 + ... + 133947187.

It is an arithmetic number, because the mean of its divisors is an integer number (119342883330).

Almost surely, 2^{1221021010522} is an apocalyptic number.

1221021010522 is a deficient number, since it is larger than the sum of its proper divisors (688465122758).

1221021010522 is a wasteful number, since it uses less digits than its factorization.

1221021010522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267885357.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 1221021010522 its reverse (2250101201221), we get a palindrome (3471122211743).

The spelling of 1221021010522 in words is "one trillion, two hundred twenty-one billion, twenty-one million, ten thousand, five hundred twenty-two".