1321220109138 has 32 divisors (see below), whose sum is σ = 2648855390400. Its totient is φ = 439337902080.

The previous prime is 1321220109127. The next prime is 1321220109199. The reversal of 1321220109138 is 8319010221231.

It is a super-2 number, since 2×1321220109138² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321220109099 and 1321220109108.

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, 14180581 + ... + 14273447.

It is an arithmetic number, because the mean of its divisors is an integer number (82776730950).

Almost surely, 2^{1321220109138} is an apocalyptic number.

1321220109138 is an abundant number, since it is smaller than the sum of its proper divisors (1327635281262).

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

1321220109138 is a wasteful number, since it uses less digits than its factorization.

1321220109138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98602.

The product of its (nonzero) digits is 5184, while the sum is 33.

The spelling of 1321220109138 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, one hundred nine thousand, one hundred thirty-eight".