1221326036016 has 80 divisors (see below), whose sum is σ = 3226846968576. Its totient is φ = 397908429568.

The previous prime is 1221326035991. The next prime is 1221326036041. The reversal of 1221326036016 is 6106306231221.

It is an interprime number because it is at equal distance from previous prime (1221326035991) and next prime (1221326036041).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243630 + ... + 1581773.

Almost surely, 2^{1221326036016} is an apocalyptic number.

1221326036016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221326036016 is an abundant number, since it is smaller than the sum of its proper divisors (2005520932560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221326036016 is a wasteful number, since it uses less digits than its factorization.

1221326036016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825730 (or 1825724 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 1221326036016 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-six million, thirty-six thousand, sixteen".