1316221305621 has 32 divisors (see below), whose sum is σ = 1885042368000. Its totient is φ = 814373921088.

The previous prime is 1316221305589. The next prime is 1316221305671. The reversal of 1316221305621 is 1265031226131.

It is not a de Polignac number, because 1316221305621 - 2⁵ = 1316221305589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316221305671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1660270 + ... + 2321408.

It is an arithmetic number, because the mean of its divisors is an integer number (58907574000).

Almost surely, 2^{1316221305621} is an apocalyptic number.

It is an amenable number.

1316221305621 is a deficient number, since it is larger than the sum of its proper divisors (568821062379).

1316221305621 is a wasteful number, since it uses less digits than its factorization.

1316221305621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661873.

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 1316221305621 in words is "one trillion, three hundred sixteen billion, two hundred twenty-one million, three hundred five thousand, six hundred twenty-one".