1221353443522 has 8 divisors (see below), whose sum is σ = 1874635518096. Its totient is φ = 596474937492.

The previous prime is 1221353443447. The next prime is 1221353443561. The reversal of 1221353443522 is 2253443531221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7100892028 + ... + 7100892199.

It is an arithmetic number, because the mean of its divisors is an integer number (234329439762).

Almost surely, 2^{1221353443522} is an apocalyptic number.

1221353443522 is a deficient number, since it is larger than the sum of its proper divisors (653282074574).

1221353443522 is a wasteful number, since it uses less digits than its factorization.

1221353443522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14201784272.

The product of its digits is 172800, while the sum is 37.

Adding to 1221353443522 its reverse (2253443531221), we get a palindrome (3474796974743).

The spelling of 1221353443522 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-three million, four hundred forty-three thousand, five hundred twenty-two".